The octane rating of pure ethanol is 100, but when it's blended with gasoline, it performs as if it's 112. It takes the best race fuel to win races. Tetra-ethyl lead, developed in the early 20's by Dupont and controlled by GM wasn't popular or readily available nationwide for another 10 years. Is it true that the brand of gas I use matters? In most areas of the United States, regular unleaded gasoline is 87 octane, midgrade is 89 and premium is 91 to 93. Always refer to your owners manual before using Unleaded 91. This patented formula is our best, most advanced fuel ever. This iso-octane has been assigned the reference value of 100 for testing purposes. What goes into your tank can matter for so many different reasons. Derived from renewable resources, it is generally more cost-effective compared to other petroleum fuels. If you dont see the list, simply google top tier gas. Second, which gas station has the highest quality gas? Gas Station Near Me. Portable containers can build up a static electric charge during transport. The company has been selling off assets that are not related to its core business and has been using the proceeds to pay down debt. The most likely scenario for Shell gasoline to be more expensive is if the additive is more costly to add, or if other stations are using base gasoline from the local distributor refinery. Because the higher-octane levels are the distinguishing feature, the only real benefit you get is lowering the risk of engine knocking, which isnt a big deal on most modern fuel systems. It contains up to 15% ethanol, which is up to 50% more ethanol than our other E10 grades. NPFA: 30A states: DO NOT ALLOW INDIVIDUALS UNDER LICENSED AGE TO USE THE PUMP. The detergents are added to the gas by the gas company before being sent to the station. Typically, such labels are placed on or near the gasoline dispensers. Premium Diesel is suitable for all diesel engines, in both automotive and industrial applications. Speedway is a gas station chain that is licensed to sell Top Tier gasoline. Many people say theyve had no problems with Speedways gas Its important to know the difference between unleaded regular and premium gas. The higher octane level can be good for performance. Some people might feel that premium gas is an unnecessary luxury, however, fueling up with a higher-quality gasoline really can impact your vehicle's fuel economy and engine responsiveness. We're holding another contest (again for 50 cool bucks): Text PUMP to 24587 anytime between now and Wednesday at 5 to enter. Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level: Some companies have different names for these grades of gasoline, such as unleaded, super, or super premium, but they all refer to the octane rating. 93 is available at select Kum & Go and Murphy USA / Walmart locations. What states are Speedway gas stations in? With 94 octane, it delivers the highest octane rating of any retail fuel on the mass market in the U.S., combined with Top Tier detergency to help make your engine run cleaner, longer, and more efficiently. Regular gasoline is usually 87 octane, premium fuel is 91 or 93 octane, and midgrade is usually 89 octane. Come test out some of the products still in development and let us know what you think! When it comes to MPG, there isn't a big difference between unleaded and premium, but you can expect more aggressive driving . There is normally a sticker on the pump to identify is ethanol is present. Most modern engines have sensors to detect knocking. Energy use in homes, commercial buildings, manufacturing, and transportation. The higher an octane number, the more stable the fuel. It is designed for motorists who want to restore and maintain engine power through active engine protection. Lower performance vehicles dont require premium fuel and will only waste your money. **Compared to minimum detergent gasoline. Doughnuts. Restore the performance of your engine with our best performing Unleaded grade. Ethanol, also referred to as Unleaded E10, is ethyl alcohol made by the fermentation of sugars in certain plants such as corn or sugarcane. Premium 93). Sheetz's price for . Click the articles below to learn more about TOP TIER. . . Premium gas (often 91 to 94) is often the highest octane gas sold. The biggest difference between regular and premium gas is the level of octane that is in it. Brand. LPG, commonly called LPG Autogas, combines a blend of propane and butane to form a clean-burning liquified gas. If a fire starts, do not remove the nozzle - back away immediately. That's why performance cars with higher compression engines . We understand that customers cannot afford to compromise on quality, which is why Speedway fuel is backed by our Speedway Quality . Later, she learned that Speedway gas doesn't meet the same industry standard Shell fuels do. Their secret is Mobile Synergy, a unique blend of 9 different additives. Marathon stations are typically located in rural areas and so their gas is usually of higher quality. Speedway Petroleum Pty Ltd. All Rights Reserved. Driving a Porsche or a Corvette, go for it! Sunoco puts the same focus and care into the four fuel grades dispensed at its stations that it does for the race fuel that powers the fastest racing machines around the world. The common fuel ratings (87, for instance) refer to the composition of gasoline. It is otherwise basically identical. Rated 3.9 / 5. When it comes to gas quality, Speedway is not a Top Tier fuel retailer. Oil is an important source of revenue for both companies. The increased octane has the benefit of reduced friction and in-built rust inhibitor to delivering further enhanced engine performance. For the rest of us, we are faced with the unpleasant reality that the refineries are all but tied into putting ethanol in premium gas. 2023 Speedway LLC. The (R+M)/2 you see on the label refers to the average of the research octane number (RON) and the motor octane number (MON) ratings. Energy-Related Carbon Dioxide Emissions, Energy-Related Carbon Dioxide Emissions at the State Level, through 2018, Monthly Crude Oil and Natural Gas Production, Annual Solar Photovoltaic Module Shipments Report, Midwest and Rocky Mountain Transportation Fuels Markets, East Coast and Gulf Coast Transportation Fuels Markets. 02/24/2023. Is Speedway Top Tier Gas. We are Reddit's central hub for vehicle-related discussion including industry news, reviews, projects, videos, DIY guides, stories, and more. Interestingly enough, in 2021, convenience store . Up to you if you consider this conclusive and/or independent. This is one of the cleanest convenience stores you go into. 95. But I can't find all gas stations that serve 93 octane gasoline on my own. When you access this website your data will be processed and stored in the United States. Octane ratings in Eastern Idaho are 85/87/91 in Western Idaho the octane ratings are 87/89/91. Performance. Greenhouse gas data, voluntary reporting, electric power plant emissions. Regular is 87 octane; Midgrade and Premium grades are required to have the octane rating as part of the name (i.e. I have yet to see any conclusive, independent evidence that 'top tier' additive packages actually mean anything other than marketing. Give Speedway Towing & Roadside Assistance a call when you find yourself in a situation where you need help. Chevron and Exxon typically have higher prices than Costco and Shell, but this is because they offer better quality gas. Northwest Arkansas primarily sells 87/89/91 octane. Ethanol is added to premium gas to raise the octane level and differentiate it from the low-octane regular gas. The octane rating for E15 (15% ethanol) is 88 octane and E85 (85% ethanol) is 108 octane. Premium has an octane rating of 91 or higher, compared to 87 for regular octane. Average octane in 1930 was 60 RON. ARCO has a reputation for offering considerably lower prices for its fuel than other gas stations. All states require gas pumps to be labeled with the correct octane level and nearly all states do regular testing to make sure gas stations are in compliance. Although this eliminates the knock, it can cause the engine to run less efficiently. Editor's Pick: Chevron. Saving money on fuel can be as simple as spending more time coasting, cleaning out your trunk, or just slowing down. A proactive process focusing on increased safety awareness has been put in place to help prevent accidents and injuries at our convenience stores. Heres a list of the best gas stations to visit: Costco. Regular gas has a minimum level of 87 octane in most places. Were giving away hundreds of Speedway x PAC-MAN & Bandai Namco Entertainment Inc. prizes to power up your home arcade. In conclusion, Chevron is the best gas station for quality gas. improve your browsing experience, and analyze our traffic. Here are some things to keep in mind when thinking about the quality of Speedways gas: There have been no complaints or reports of Speedways gas being poor quality But first, let's take a look at the definition of top-tier gas. I do wish they would retest with a small displacement turbo since they're the biggest offenders for carbon buildup. Download the Sunoco app today. What does a blinking blue light on a smoke detector mean? Since the 1990s, the Environmental Protection Agency has required a minimum level of detergent for all gas sold in the United States. Speedway Diesel is suitable for all diesel engines, in both automotive and industrial applications. Yes. Now although I've seen Sunoco do 95 Octane for maybe a dime more than the Premium fuel, the "Racing Fuel" at this station (LukOil) was $8.99 a gallon! Sign up for email subcriptions to receive messages about specific EIA products. We may also share information about your use of our site with our analytics partners. The octane ratings below are the lowest allowed by law and may or may not reflect the actual levels offered for sale at most gas stations. DeLeon Springs, FL 32130. In many cases, it will specify which type of gasoline you should use in your vehicle. New Shell V-Power NiTRO Premium Gasoline is a revolutionary new premium formula that provides the best total engine protection available. Access links from a compatible smartphone. 26-28 Cumberland Highway, Smithfield,NSW 2164, Australia. In a single click, how many steps, Restore Deleted Files from the Trash on a Mac (Not Emptied yet) by clicking on the icon in the Trash Bin. View our Privacy Notice. Or is some fuel better than others? This page was last edited on 19 December 2022, at 19:02. Premium: Premium octane falls between 91 and 94, averaging at about 93. The spark plug will not fire instantly. Its a 91 ford, you can put any major gas brand in it and be fine. Premium 95 octane petrol is designed to be more fuel-efficient through reduced fuel consumption, smoother engine operation and improved driving performance. All Rights Reserved. Our fuels adhere to the Fuel Quality Standards Act 2000 and our internal management system is aligned with ISO 9001. The difference in prices between premium and lower octane grades has also increased. Despite the controversy, Speedway remains one of the most popular gas station chains in the country. Regular gasoline will sit between 85 and 87. Or parasitic drain on the battery. Now Im at college until May and the car is parked. is a major oil company. E85 gas (also known as flex fuel) is a high-level combination of ethanol and gasoline that consists of 51 percent to 83 percent ethanol blended with gasoline. Jay Thomas AKA @337Speed on all our favorite apps reveals his best advice for getting the most out of a high-performance engine. You can also check your cars owners manual. The TOP TIER logo means you're getting fuel that meets the performance requirements set by engine manufacturers. These numbers are determined through engine testing, resulting in two measurements: Research Octane Number (RON) and Motor Octane Number (MON). You need to know a little about combustion to understand the difference. The Great American Survival Manual to The Almost Entirely Enjoyable Family Road Trip. In comparison, spontaneous combustion, also called auto-ignition, detonation, or knock, happens when rising temperature and pressure from the primary combustion causes unburned fuel to ignite. Mobil.Is it preferable to e85 or regular gas? This uncontrolled secondary combustion causes pressure in the cylinder to spike and causes the knock to occur. Of the 18 isomers of normal octane (C8H18), octane gets its name from the 2,2,4-Trimethylpentane compound, which is highly resistant to auto-ignition. Youre fine. Maps, tools, and resources related to energy disruptions and infrastructure. Speedway is a Top Tier gasoline licensee, and all retail locations must adhere to those standards. Regardless of legality fuel with an octane rating of less than 82 is generally not offered for sale in most states. National Avg. 'Ole Henry never made any engines that needed a fuel additive made and promoted by rivals. In 2021, we're unfortunately seeing much higher prices, which makes it tempting to switch to a . Speedway Gasoline WITH Ethanol - All Grades (Regular, Mid Grade, Premium) 0110SPE012.pdf: Gasoline: 86290-81-5: Speedway K 1 Kerosene: 0113SPE012.pdf: Kerosene: 64724-81-0: Speedway No 2 Ultra Low Sulfur Diesel: 0115SPE012.pdf: . Well before going away to school I filled up my 1991 Mustang GT with a full tank of speedway gasoline. Regular gasoline is usually 87 octane, premium fuel is 91 or 93 octane, and midgrade . Top tier doesnt mean much IMO as kwik trip is on the list and their gas is awful. Tools to customize searches, view specific data sets, study detailed documentation, and access time-series data. This means that individual molecules hold carbon and hydrogen molecules. 115. With each fuel option there is a number that measures the level of octane in the gasoline. Its the biggest convenience store chain located in central Ohio. Sunoco's race fuels chart helps you discover which Sunoco race fuel is right for your vehicle. Primary Reference Fuels (PRF) of precisely known octane are formed by combining iso-octane, heptane, and other well-known standards such as toluene. Minimum Octane Requirement. 1920 Harden Blvd. Between 8 a.m. and 5 p.m., drivers of flex-fuel vehicles can fill up on E85 for only 85 cents a gallon. The results showed that on average, non-Top Tier gasoline had 19 times more carbon deposits on injectors, on intake valves, and in the combustion chamber than Top Tier gasoline. This measurement is taken by adjusting the octane engine's cylinder height, which changes the compression ratio/pressure in the engine until the knocking reaches a specific intensity level. MA Reg. Be sure to check your owners manual for the recommended octane level for your vehicle. Due to its unique blend, Unleaded E10 is more renewable than regular unleaded grades as it offsets greenhouse gas emissions, decreasing your carbon footprint. How much ethanol is in gasoline, and how does it affect fuel economy? In fact, on E85 engines, some FFVs have more torque and horsepower than regular gasoline engines. Chevron, Shell, Exxon, Mobil, and Texaco are all top-tier brands that are known for their quality. Sunoco Ultratech fuel meets both the demands of high-performance drivers and the specifications of the Top Tier Detergent Gasoline Program. Gilbarco, Dresser Wayne, and other fueling systems are used by the company. Premium Gas Lasts Longer Unfortunately, there is nothing in premium gasoline that makes it last longer than other pump-powered fuels. Sunoco's race fuels chart helps you discover which Sunoco race fuel is right for your vehicle. The latest station grand opening is Wednesday the Mobil station in Fullerton. So if youre looking to keep your car running smoothly and avoid any potential problems down the road, using Top Tier gasoline is always a good idea. 7-Eleven acquired the brand. The acquired stores will be rebranded as Speedway, though Marathon officials have stated that the company may retain the ARCO name on the West Coast and in Mexico. That means regular for cars using regular, or 87 octane; and premium for cars using premium, meaning 91 or 93 octane. I was surprised to find that out a couple months ago. How much does a 8 week old cocker spaniel weight? You may have limited options depending on where and when you have to fill up. Chevrolet Traverse. Despite this flexibility, many testers still prefer to use more than one machine with each specifically set up and calibrated to perform either RON or MON tests. Click below to find your nearest location. A similar undesirable condition is called pre-ignition, when the fuel ignites on its own before the spark ignites it. Quality is just one of the reasons why the world's top drivers choose Sunoco fuels. The main benefit of using Top Tier gasoline is that it can help to keep your engine clean. Quora is used around the world. Normal combustion in a gasoline engine cylinder, Source: General Chemistry: Principles, Patterns, and Applications, 2011 (copyrighted), Spontaneous combustion in a gasoline engine cylinder causing engine knock. Get a 93 Octane Gas Station on the Map. #3. Most states do not mandate certain standard gasoline grade octane ratings. I have a hard time believing the top tier gas is any better, in regular everyday operation, than middle tier stuff from a reputable station. [3] Gasoline marketers agree when they sign on to Top Tier . Measured using industry standard and Shell proprietary tests. This technology has been adopted by vehicle manufactures to help meet the latest requirements on diesel engine emissions. Watch Cody take a drive while discussing the importance of running a Top Tier fuel like Sunoco Ultratech, along with other tips to get the most out of your vehicle. Speedway uses Marathon fuel, which is top tier. Your car, truck, or SUV - new or used - is one of the most expensive purchases you'll ever make. Where do hydrocarbon gas liquids come from? Tampa, FL 33614. Our special blend helps fuel injectors stay clean to ensure your diesel engine operates at its best. It's no wonder that BMW M recommends Shell V-Power NiTRO+ and that it's been the official fuel of Car and Driver . Don't even think about it. Why Is Your Zucchini Plant Stem Splitting? Which ben and jerrys has the most calories. For correct in-service operation and to meet current emission standards, many modern vehicles require Premium Unleaded, as these cars will be fitted with engines that will require a higher octane of fuel for maximum efficiency and performance. How To Find A Top Tier Gasoline Station And with new content being added every day, there's always something new to discover. Gas Stations. Answer (1 of 9): In what country? Is Speedway Fuel also on the Top Tier? Kwik Trip is proud to support farmers and offer E85 at many of our locations. What fuels your adventure? The company has come under fire in recent years for its pricing practices. Speedway is one of the largest chain retailers of gasoline in the United States. Some cars should have a higher level of octane in their gas, but most standard vehicles on the road can do with regular just . Explore our comprehensive list of tips to help you improve fuel efficiency and get more out of every trip. Octane rating is the measure of a fuel's ability to resist "knocking" or "pinging" during combustion, caused by the air/fuel mixture detonating prematurely in the engine. Servicing thousands of Australians every day, we are committed to providing motorists with consistent, reliable, high-quality fuels. These fires have occurred, however, and there have been injuries and property damage as a result. If your vehicle is equipped with Selective Catalytic Reduction technology, it will require an additive such as AdBlue to be operational. All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise. Top Tier gasoline is a designation given to gasolines that contain a higher concentration of detergent than what is required by the Environmental Protection Agency (EPA). From drag racing to drifting, they continue to trust our high-quality performance fuel every weekend. AdBlue was created to break down the NOx in exhaust gasses into harmless elements before they are expelled from the car. Premium level fuels will have a higher- octane level that is usually sitting at about 91. You can also check the TOP TIER Licensed Brands lists below. Aloha Petroleum, Amoco, ARCO, Beacon, BP, Breakaway, Break Time, Cenex, Chevron, CITGO, Costco, CountryMark, Diamond Shamrock, Entec, Esso, Express Mart, Exxon, Fast Fuel, HFN, Hele, Holiday, Kwik Star, Irving, Kirkland Signature, Kwik Star, Kwik Trip, Marathon, Metro Petro, MFA, Mobil, Ohana Fuels. #1. Locate the files you, Is it legal to drive alone in Nevada if you have a permit? To help provide the best possible experience, To learn about all of the benefits of Ultratech, click the articles below. Discover what steps we take to ensure the quality of our fuels. Oil tankers transport this gas to various companies, so the gasoline portion of the gas is the same (up to a point). Shells revenues in the last ten years were 22.2% higher on average than those of BP. When the motorist then returns to the vehicle fill pipe, the static may discharge at the fill point, potentially causing a fire. In addition, many carmakers now require the use of Top Tier gasoline in order to maintain your vehicles warranty. I've never had a fuel related issue on any piece of equipment. Speedway has a modest gas price for this area, with the most expensive in the top ten being $3.69 per gallon. While the base 2.5-liter four-cylinder engine in the compact Buick Envision runs on a regular basis, the available 2.0-liter turbo-four engine uses premium-grade gasoline. Most modern unleaded vehicles can operate on Premium 95. MA Prem. Costco. Let's get started! . Yes, it matters because some brands contain more detergent additives to prevent carbon deposits from forming inside your engine. To be considered Top Tier, the gasoline must have a higher concentration . There's a Speedway a couple miles from my house that sells Cam2 110 octane leaded fuel from a pump. $3.318. https://www.aaa.com/AAA/common/AAR/files/Fuel-Quality-Full-Report.pdf. Your hub for locating race fuel near you, learning the Sunoco Race Fuels history, and keeping up with racing news. Long-term holder as well. Static electricity build-up occurs when a motorist slides across the vehicle seat when they re-enter their vehicle during refueling. Ethanol is required in most areas of the country. It is caused by chemical aspects and is where octane levels come in. Meanwhile, in Europe, most countries do not sell gas with an octane rating below 95, and you can buy . Premium-grade gasoline, no matter what youve heard, wont do much more to clean deposits from your fuel injectors and other parts of the system because todays regular gasoline contains the same detergent additives as regular gasoline. Sinclair. Why Is Top Tier Gasoline Important? Through a flexible supply chain, we have established a reputation for providing customers with premium fuels and lubricants. Speedway sells a variety of gasoline grades, including regular, mid-grade, premium, and diesel. Top Tier is a performance standard for gasoline, backed by major automakers. The large number on the yellow gasoline pump octane label is the minimum octane rating. Since premium-grade gas often costs about 20 percent more than regular-grade gas, some folks have thought of trying to save money by using a $4 bottle of an octane-booster product to raise the octane level of regular-grade gas to that of premium. It's off . It's not just a random date that the food company picked out of thin air. What are the projections for U.S. gasoline and diesel fuel prices? By continuing to visit or interact with our website, you consent to the use of cookies and similar technologies as described in our Privacy Policy. It's important to prevent carbon build up for many modern small displacement turbocharged motors. Basically no different from putting in a small amount of Techron into your fuel with every tank. Speedway is a Top Tier gasoline licensee, and all retail locations must adhere to those standards. Speedway may not be a top tier grade, but they are at the top of the heap when it comes to price spikes. Seven is expanding in the United States. Car professionals state that there isnt a noticeable difference when it comes to performance, so save your money and go with the cheap one. link to Can you cook mince 1 day out of date? Each of us must promptly report unsafe or unhealthy conditions and immediately take steps to correct those conditions. We're giving away hundreds of Speedway x PAC-MAN & Bandai . Per a AAA study that someone else posted here: Among brands tested, the use of non-TOP TIER gasolines resulted in up to 19 times more engine deposits than TOP TIER brands after just 4,000 miles of simulated driving. When detected, the computer delays the initial spark, which causes the controlled combustion to take place at a point when compression is not at its highest point. Diesel cars release nitrogen oxide (NOx) into the air, which can be harmful in abundance. AAA also found Top . Ethanol production in the United States creates many jobs and supports all the great farmers. These PRFs are used to bracket a given fuel sample to determine the pressure at which similar knock intensities are observed. U.S. It's because we offer the highest quality fuel available including every grade of gasoline, diesel and kerosene. In 2021, 7-Eleven Inc. purchased Speedway for $21 billion. When she's not blogging or spending time with her family, you can usually find her rooting around in the garden or at the hardware store. Here are some examples of labels you may see at the location where you refuel your vehicle. In addition, as Argonne National Laboratory states . 100. Do you want exclusive offers on food, merchandise, and more? Clean toilets? Always refer to your owners manual before using Unleaded E10. TOP TIER Approved Gasoline Brands. My Sunoco has the best E85 in town always tests 85+ and they sell C16 from a pump as well. In a nutshell, buy the gasoline your owner's manual calls for. Therefore, higher octane levels will reduce the chances of knocking in the engine. Since then we've discovered a host of other less problematic . The state agency tests for factors such as octane levels, ethanol, sulfur and aromatics such as . Commonly the most cost-effective fuel type, Unleaded 91 fuel has proven performance in unleaded vehicles by eroding compounds that form in tanks which affect exhaust systems and spark plugs. The Speedway Effect shows that the more Speedway stations in an area, the larger the price spikes are. The additives composition, quantity, and quality are all proprietary. AdBlue is a diesel exhaust fluid used in modern trucks that employ Selective Catalytic Reduction (SCR) technology. All gasoline sold in the United States is required by the EPA to have a minimum level of fuel additive . Check your owners manual to find out whether your vehicle needs. All Rights Reserved. Convenience Stores. Octane rating is a measure of a fuel's ability to resist 'knock.'. With the adoption of cleaner engine technologies, running a diesel engine now means producing fewer greenhouse emissions as it burns much slower than a vehicle using regular petrol. Speedway is committed to providing a safe and healthy environment at every one of our convenience stores. Gilbarco, Dresser Wayne, and other fueling systems are used by the company. In the United States and Canada, octane ratings are in AKI, commonly shown as "(R+M)/2". Shell V-Power NiTRO+ Premium Gasoline is engineered with four levels of defense against gunk, corrosion, wear and friction to help keep your engine running like new.*. For over 20 years, GasBuddy has saved users over $3.1 billion. The 302 is a pretty stout motor so Im not too concerned but what Im reading is making me a bit nervous. The presence of renewable sources makes this fuel-grade suitable for those who are environmentally conscious and are trying to reduce their carbon footprint. Shale Unit. How Do You Get Rid Of Hard Calcium Deposits In The Shower? Editors Pick: Chevron has the best quality gas. Thats why the worlds top race car drivers have fueled their wins with Sunoco for over 50 years. Ultra 94 is the highest octane fuel available at the pump at Sunoco. Since you live in Jacksonville Fla, your local gasoline has 10% ethanol. Premium gas with higher octane levels (91-94) is required for some high-output engines. Everything you need to get the most out of your ride. Modern engine computers minimize this condition by controlling the timing of valves and fuel injection; however, this control mechanism can also come with a fuel-efficiency or emissions penalty. The amount of ethanol in premium gas will differ from one grade of fuel to another . Over time, showerheads can become clogged with deposits of calcium, magnesium, lime, silica, and other minerals. So we ran a few common ones past Zachary J. Santner, technical specialist at Sunoco Race Fuels. In the U.S., unleaded gasoline typically has octane ratings of 87 (regular), 88-90 (midgrade), and 91-94 (premium). Or, in layman's terms, the higher the octane rating, the less likely the fuel is going to pre-ignite (read: explode unexpectedly) at higher pressures and damage your engine. Its a decision that can have a lasting impact, both on your engine and your wallet. . Southwest Missouri in the Ozark Mountains and Mark Twain primarily only sell 87/89/91.