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There will be some refueling in New Mexico where I'm concerned about the overlap. Lots of people do so. When it says it raises octane 4 points, it means .4. If you are worried, just mix it with 89 octane. 87 vs 91 Octane Gas. The difference in the bill is not even noticeable and you probably are saving performance and MPG buy using higher grade so it all evens out. I'm in Denver. A minimum of 87 octane/87 AKI (91 RON); If operating at high altitude, see below. There's no harm in mixing, and you can more or less assume that you'll end up with an effective octane rating somewhere in the middle. You've been potentially damaging your engine with every tank of 85. E85 is a fuel blend. With a 50/50 mix, it averages to 101.5 octane, which is what my engine needs for its compression ratio. 87 is Mid-grade and 91 is Premium. On FlexFuel (E85) vehicles manufacturer's offer this advice: Run the car dow as low as you can on unleaded. No matter what fuel you put into your FFV, it’s stored in the same tank. As I understand it, they essentially refine 105 octane and 85 octane, and then get all the numbers in between by simply mixing those two. No, it's a 2014 Honda CRV. Teen pop star says industry 'vultures' descended on her, MLB umpires have forgotten how baserunning works, Team owner draws ire for list of 5 most important Lakers, Woman in 'Disaster Girl' meme makes an NFT fortune. This generally means gas blended with ethanol and methanol. If you find yourself at one of these places, use the calculator below to figure out the correct mixture of the octanes to get to 93 octane. So I would like to know whether I can safely use 85 octane fuel without risking problems. I know seems like a weird question, but obviously the van can take both, Im just not sure on how this works. Premium gas can cost 20 to 60 cents more per gallon depending on where you live. Flex Fuel vehicles have sensors that analyze your gas tank on startup and make adjustments to the engine to work with the mixture of E-85 and 87, 89, … You've been potentially damaging your engine with every tank of 85. Still have questions? When it comes to gas, you can choose between a lower octane gas or opt for a higher octane rating. IIRC, it was made for high altitudes for carbureted engines, not fuel injected. Fill one full tank of E85 and let that run through. Likely no permanent effects in any case. E85 is up to 85% ethanol and may have a variety of octane. E85 fuels contain a mixture of 85 percent ethanol and 15 percent gasoline. Get your answers by asking now. There are plenty of gas stations out there that happen to serve gasoline at a higher octane than 93. Additionally, octane levels also reflect the fuel’s burn-rate. It doesn't work this way. All altitude does is thin the air, which your computer automatically injects less fuel. The owner's manual for my car (a 2006 Honda Civic) specifies 87 octane fuel. Just my two cents. Will there be any issues with some slight mixing of 85 and 87 (say I fill up with 87 at 1/8 of a tank left of 85) or should I really try to run it down as close to empty as possible before putting in the 87? It improves my power output (butt dyno) and gas mileage by 10% or so. What are some of the anti-knock properties you're referring to? Keep in mind you get a severe decrease in actual energy, so expect your MPG to drop a bit wit E85 in the tank. I've experienced a bit on a handful of vehicles. Want to move to our town? what is the purpose of a parking brake when putting a vehicle in gear is enough to hold it on a hill? GM vehicles with flexible fuel engines include the Chevrolet Avalanche, GMC Savana, Cadillac Escalade and Hummer H2. Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. I would think there would be some false-advertising ramifications in play if 85 wasn't "real" regular and incorrectly marking up 87 as premium? Mixing the grades to get 91 or so shouldn't hurt, but it probably isn't saving you much money. Where will you be going after Y/A shuts down? I do not run that crap gas in my car. Having octane that's too low will really just result in a slight loss of power and MPG, but shouldn't cause any real lasting problems. https://www.caranddriver.com/research/a31851426/what-is-e85-gas The boat is new so the NON-Ethanol gas should be clean. Paying more to pump premium gas into a car designed for regular gas will have a low return on investment. This is fine, as regular fuel’s 87 octane rating (which can be lower at higher altitudes and in Mexico) meets the needs of most new-car engines. However, the manual presumably was written for the majority of the customers who live near sea level, and may not have considered altitude effects. The regular gasoline might have an 85 octane level instead of an 87, but the occasional fill-up with this fuel isn’t going to harm your engine. My 2019 Forester manual says to use 87 Octane fuel, but in Colorado and other high elevation states they sell 85 Octane gas as regular gas. There will be no changes to other Yahoo properties or services, or your Yahoo account. A blend that holds ~85% ethanol and ~15% gasoline. The octane ratings for regular-grade fuel range from 85 to 87, midgrades are rated 88 to 90, and 91 and higher is premium. Yeah.. After pouring Race Gas in simply shake the container to make sure it mixes completely. I’d run the 87 non ethanol with the oil mix of your choice and see how it goes. The difference calculation to 100 (13 when then octane is 87) is made up of a specialized formula the gas station creates of different chemical elements designed to clean your engine. Consumers fortunate enough to drive certain luxury or high-performance models may purchase premium fuel, as its higher octane rating (typically 91-93) is often recommended or required for optimal engine performance in those vehicles. Yes, standard gasoline can be used in flex-fuel vehicles. However, it showed a much higher decrease when the engine returned to its normal operating temperature, and as it got hotter on the dyno, showed an even greater a loss of power. All altitude does is thin the air, which your computer automatically injects less fuel. Should I care about rusted-out brake dust shields? So, for the sake of discussion lets say I start only using 87 octane from here on out, do I need to run the tank to empty to get rid of all the 85, or is a little overlap ok? Best answer: Can I just half & half 89 and 93 and get a tank full of 91 Yes, you absolutely can. By the time you get to low elevation you'll need to fill up and 87 will be available. Looks like you're using new Reddit on an old browser. While regular fuel blends have an octane reading varying from 87 to 94... fuel and ethanol blends ranging from E10, E20 ... you can experience poor performance and even problems with fuel injectors. Yes, you can mix any of our race fuels. 87 gasoline refers to the octane of the fuel. Regular 87 fuel burns slower than Premium 91 fuel, which will burn hotter and create more combustion. If your owners manual recommends premium you may or may not notice a difference in performance and/or fuel economy when using regular. You may not use E85 in a non-flex fuel (E85) engine. The higher the fuel octane rating, the less noise will be noticeable on combustion. (In laymen’s terms, if you coat a piece of cloth in Regular 87 … I moved out west this summer and saw 85 octane for the first time. The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. The dyno sheet for the 91-octane fuel showed horsepower and torque figures within one point of those measured on the 89-octane fuel. Two common octane ratings are 87 and 91. 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. Fuel for your lawn mower or outdoor power equipment must meet these requirements: Clean and fresh - fuel can begin to deteriorate in as little as 30 days. According to the article below, there are some scenarios when premium would be warranted and they make sense - but in Denver, 87 is sold as premium (85 as regular). It is still fuel. But remember – if your engine needs an unleaded fuel, you don’t want to mix leaded with unleaded. No. As the term "flexible fuel" implies, any E85 ethanol flex-fuel vehicle can run on 100 percent E85, 100 percent pump gasoline of any octane , or any combination of E85 ethanol and gasoline. Say you mixed 2 gallons of 87 octane with 2 gallons of 89 octane and 2 gallons of 93 octane. Cowboys draft pick accused of multiple violent acts, Colorado woman killed in suspected bear attack, Jets select 2 players with same name in NFL draft, After Biden speech, N. Korea warns of 'grave situation'. Yeah, I have no problem at all using 87, I know it's needed in most places, I just take advantage of the 85 when I can. You will experience better gas mileage than using E85 in your E85 vehicle. I live in Denver and due to the elevation we typically run 85 octane - it's the equivalent of 87 at sea level. By blending pump premium (or 91 if you like) with E85, you can create a custom blend of high-octane fuel. Flex Fuel vehicles have sensors that analyze your gas tank on startup and make adjustments to the engine to work with the mixture of E-85 and 87, 89, or 93 octane unleaded gasoline. It won't cause problems. 90 found in home; smuggling operation suspected. Since the Tundra uses E10 gasoline regularly, will mixing in NON-Ethanol gas pumped out of the boat cause any problems for the Truck? So 87 octane becomes 87.4 octane. Simply put, if you mix 5 gallons of 91 octane pump gas with 5 gallons of E85, you get 10 gallons of a 96-octane fuel that’s very close to E50, or 50-percent ethanol and 50-percent gasoline. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page. Afterward, you are OK to use any combination of E85 and unleaded, yes, you can mix them. I have a aero golf cart and it won’t go but the light blinking? It really doesn't matter. Other engines can simply get by on 85 or 87 octane. Talk about that car. It's not a really bad idea, your car can pull timing and accommodate the lower octane. Gasoline with up to 10% ethanol (gasohol) or up to 15% MTBE (methyl tertiary butyl ether), is acceptable. I'll update the post with that info, thanks! You should have to ill effects by mixing gas that you didn't have by running the 85 octane in the first place. Luckily, my state is full of preppers, so I can get 91 octane ethanol-free gas. Ethanol fuel mixtures have "E" numbers which describe the percentage of ethanol fuel in the mixture by volume, for example, E85 is 85% anhydrous ethanol and 15% gasoline. To save money on gas should I take some from my neighbors gas take when they are at work? Thank you for the info! Contrary to popular belief, the octane boost in a bottle does very little for octane requirements. My owner's manual says the same thing as other posters. I don’t think you will have an issue. On my 2016 WRX the owner's manual says using an octane rating of 87 wouldn't void my warranty, so I went ahead and experimented. Is influencer Meena Harris exploiting family ties? My advice would be just fill up normally as you travel around the country and when you know you have octane that's too low for the area, just stay off the throttle and you'll be fine. It doesn't work this way. http://www.cartalk.com/content/premium-vs-regular-1, You get more HP TORQUE and MPG and less knock and wear for a couple cents more per a dollar, where's the harm, New comments cannot be posted and votes cannot be cast. I wouldn't be too worried about it. In the U.S., unleaded gasoline typically has octane ratings of 87 (regular), 88–90 (midgrade), and 91–94 (premium). Turbocharged engines benefit the most from premium gasoline, with reported gains in both power and economy, and as … Problems with the transition to E10 fuel. You still need the 87 octane for its increased anti-knock properties over 85. You may not even have a choice. The main difference between 87 and 91 octane gas is just the additive that they add to it. Doing so would make a leaded fuel which could still damage oxygen sensors and catalytic converters. Press question mark to learn the rest of the keyboard shortcuts. The answer to #1 is easy. Cost Savings Through Better Chemistry. And the nice thing is you can mix it anywhere there’s a gas pump and it’s catalytic converter sage. Around here the lowest grade ethanol gas doesn’t seem to have consistent ethanol levels. I noticed the farther I get away from Denver, the harder it is to find 85. When E10 is added to a fuel system that has been using non-ethanol gasoline, ethanol, as a new solvent, will tend to dissolve and loosen deposits that are present in the tank and fuel system. Yes, the manual says 87 but all my research showed that it's for sea level and a slightly lower octane is equivalent at 5000+ ft elevation. Anhydrous ethanol can be blended with gasoline (petrol) for use in gasoline engines, but with high ethanol content only after minor engine modifications. The answer is that e85 can be mixed with regular gasoline in flex-fuel vehicles. The engine inside FFVs is designed to run on gasoline as well as other fuels. I'll be traveling to Texas for the holidays and will be filling up with 87 as I run the tank down - I know running 85 at sea level is a really bad idea. What happens then? GM vehicles with flexible fuel engines require either 87 Octane or E85 fuel. Where you would want to be more careful would be in an older engine that doesn't have computer controlled timing. If you're concerned you could fuel up with high-test first time, 87 afterward. YOUR car, your personal car that you own, the one you love/hate/loathe/adore. If there is already unleaded in the tank, can I still use the E-85 or are they not compatible. This is why most day-to-day cars can be filled with regular unleaded, while performance vehicles warrant Premium. The most likely time for fuel problems occurs when you first begin using ethanol-blended fuel. Could you imagine Honda dealing with all the warranty claims? Here's $10,000 and a bike. If you insist on using E85 ethanol fuel most or all of the time, however, and you will be compelled to make some compromises. At most gas stations I've seen, 89 octane is just a mix of 87 and 91/92. No, you will not damage your engine by mixing different octane fuel. Just as you can mix regular and premium gas, E85 is no different. If I had to use ethanol gas, 93 octane is all I would use. Can a second hand Hemi Jeep Commander turn into a money pitt. This is also common at race tracks. The 87-octane fuel maintained more power than the 89-octane fuel. I have a 2010 Toyota Tundra and a new boat with 30 gallons of NON-Ethanol gasoline that I don’t want to let sit while the boat is stored for 6 months. Yeah.. It says 87+ required in the owners manual for 2014 Honda CRV, stick to 87+, its really cheap already. You still need the 87 octane for its increased anti-knock properties over 85. I think You'll be fine. So you want to talk about your car? Since the volume of all 3 grades of fuel are the same we can simply add all 3 octane then divide that by 3 and you will get your exact octane rating of this mixed fuel, which is 89 grade fuel. This is the only right answer. New vehicles like your CRV will back off timing when they sense any knock in the engine. You may use non-ethanol gas (87 octane regular fuel) in your E85 vehicle. its not a problem. For demonstration, Pat adds 3 ounces per gallon to 87 octane pump gas which will bring it up to 93 octane. 85+89 will make 87 when mixed equally. http://community.cartalk.com/discussion/2300913/gas-octane-high-altitude-areas.

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