Standard 85 octane rated gas mixed into a 10% ethanol blend becomes the 87 octane rated fuel most of us see at the pumps. The 85-octane issue is unrelated to E-85, a reference to a motor fuel that contains a blend of gasoline and up to 85 percent ethanol. It is a top tier gas. The other thing is the manual states to use only 87 octane or higher. Below 4000 feet, people usually see 87,89 and 91. That yields a final fuel rating of between 96 and 98 octane. I know the manufacturer states 87 octane, but in higher elevation states, regular at the pump is 85 octane and mid grade is 87 octane. Winter is approaching, and I do ride my bikes year round. While mixing 85 percent 108-octane ethanol with 15 percent 93 octane would yield something in the 102 octane range, the fact is that most manufacturers mix it with 84 octane or lower. Raising the octane level may increase mileage a bit, but not enough to notice. Here in Colorado the octane ratings available are 85/87/91. 2020 Rav4 hybrid - 85 octane fuel. Actually, 85 octane fuel in Colorado will behave about the same as 87 octane fuel at near sea level. At high altitudes the service stations have 85 octane as the standard gas, one assumes this would be OK under conditions of high altitude, right. In California at sea level, I must use 91 octane. Gasoline octane levels, also referred to as octane ratings, measure the fuel’s resistance to “ engine pinging ,” which is the rattling sound that emits from an engine during acceleration. Colorado gas octane numbers anywhere above 4000 feet (which is most of the state including the entire Front Range and all throughout the mountains) are 85, 87 and 89. Differences in octane level and the amount of ethanol added to gasoline can have a dramatic impact on fuel economy and emissions. The reason for this is that in higher-altitude areas, a typical combustion engine draws in less air per cycle due to the reduced density of the atmosphere. Final results 0-60 The 85 octane is what you want to use in that area. 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. This is a to/from work car for my wife, who doesn't really need high performance. Is it that because of the altitude or some other reason that maybe it's OK to use 85 Octane in cars that have a minimum 87 Octane rating? Selling 85-octane gas in South Dakota is against state law, Attorney General Marty Jackley said Thursday. Regular 88 is EPA approved for use in model year 2001 and newer cars, light duty trucks, and flex fuel vehicles. Regular fuel typically has an 87 octane rating, mid-grade fuel typically falls between 88-90, and premium fuel is typically rated at 91-94 octane. In Utah, Idaho and Nevada, stations were selling 85-octane as regular gas. Read all about it here: Octane rating - Wikipedia, the free encyclopedia The rule of thumb is to run your vehicle on the lowest octane fuel that will not cause knocking in the engine. I find this happens whether I was/am using my 92 HP Mazda B2200 pickup, OB, or Vette. But that might not be the case much longer. Despite the flex fuel's higher octane rating (103 in this case), the flex-fuel nature of the Tahoe's 5.3-liter V8 engine prevents it from taking full advantage. I started buying my gas from Costco since they sell top tier fuel. My local Costco does not sell diesel, so until recently I was unaware of their limited octane options. If I'm at any other gas station, I put 87/88 (varies per station). Run with 114-octane Rockett race fuel, the supercharged 383 produced 643 hp and 589 lb-ft of torque at 11.4 psi. Octane is the measure of resistance to self ignition. If your engine is experiencing pre-detonation when using 87 octane gas, you may try switching to 91 octane gas to see if the problem gets resolved. An 87 octane gas is more prone to pre-detonation since it ignites at a lower temperature than 91 octane gas. This forced me to pay more for midgrade 87-octane. Anyone know if it's ok to put 85 Octane fuel in a 2017 Ford Escape SE with 1.5 ecoboost? Regular 88 (otherwise known as E15 or Unleaded 88) is an 88 octane fuel available at many Family Express® locations. I'm not the type to put in higher octane just because - but Costco tends … Many people are likely to find that most modern automotive engines call for a minimum octane level of at least 87, he said. E85 typically doesn't have an octane rating listed on the pump. Since my Crosstrek recommended 87, I opted for the 91. When there is reduced effective compression and lower oxygen content, the ability to self ignite is reduced. Other, more uncommon fuel grades include Low-Grade (85) and Super Premium (93). After jetting the blower carbs for E85, the power output jumped to … You'll get 87.5 octane. Anyone here using 85 octane fuel in their new rav4? Please explain why Denver is the only city I have visited that sells 85 Octane gas. They only offer 85 and 91 octane. A while ago I was a firm believer that you should use the lowest octane gas available that did not result in engine knock/pre-detonation. In the Rocky Mountain (high altitude) states, 85 octane is the minimum octane and 91 is the maximum octane available in fuel. Nearly every gas station in America will have some form of range from 87 to 93. United States: in the Rocky Mountain (high elevation) states, 85 AKI is the minimum octane, and 91 AKI is the maximum octane available in fuel. Costco in my area offers 85 or 91 and nothing in between. Another difference between 87 and 91 octane is the amount of power that they deliver. Apr 8, 2019 #2 As far as 85 octane regular goes, my gas mileage INCREASES, but that’s probably due to travelling at higher elevations and the mixture leaning out. Joined Jan 7, 2019 Messages 100 Reaction score 74. I didn't hear Pinging or Detonation sounds coming from the engine. If I used 87 Octane I hear Pinging before the engine adjusts itself. P. Pribilof Active Member. Is this the latest petroleum-industry scam to get more of … I read a lot of info about the 2.0 but not the 1.5. Would be interested if anyone is running 85 octane fuel and how the truck is performing. Using higher octane fuel than necessary is just a waste of money. I'm in Denver. The dyno sheet for the 91-octane fuel showed horsepower and torque figures within one point of those measured on the 89-octane fuel. By blending pump premium (or 91 if you like) with E85, you can create a custom blend of high-octane fuel. The other answers to this question are good, I just have one thing to add: 85 octane fuel is only found in colder climates. You'll get 87.5 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. RAY: The reason the octane is lower in those areas is because they're at high altitudes, where the atmospheric pressure is lower. However, since ethanol has at best, an 85 percent energy density, when compared to gasoline, you can see that ethanol does not get better gas mileage. I used 85 octane with no issues. Hello: Living in CO means the fuel octane is a bit different than many parts of the county. The octane rating for E15 (15% ethanol) is 88 octane and E85 (85% ethanol) is 108 octane. At high altitude you can get away with using lower octane. To put it in perspective, racing fuel uses 100 octane, and gas in Third World countries can dip below 85… Cost Savings Through Better Chemistry. 85 is what we use in CO as regular because of the higher altitude. Flex fuel gas mileage tends to be somewhat less than standard gasoline mileage. But that's pure ethanol, not E85. Costco only sells 85 and 91 so would like to fill that 33 gallon tank with 85 if folks aren’t seeing issues. So, the further North you go, or the higher in elevation you go. 87 is Mid-grade and 91 is Premium. This grade of fuel contains up to 15% ethanol. Since I can't put 85 in my car, I put 91 if I'm at Costco. The engines ran much better with fuel of an octane that could be effectively fired by the spark plug, which was lower octane fuel. Low-octane fuel — rated 85 or 86 as opposed to the 87 for regular gasoline — is common in the Rocky Mountain states, said General Motors fuel … When you mix 10 percent 113 octane ethanol with 85 octane gasoline it increases the octane two points to the normal 87 octane most consumers use. The reason for this is that in higher-elevation areas, a typical naturally-aspirated engine draws in less air mass … Maybe not as often. Some fuel with an 85-octane level was being sold as 87 octane and in some instances 89 octane. Also, almost all gasoline in the US contains 10 percent ethanol. What is an “octane level”? My 2007 Honda Civic SI requieres 91 octane(k20z3 engine). I think it has something to do with the … Upping the percentage of ethanol to 15% is the 88 octane rated fuel you are referring to. The 87-octane fuel maintained more power than the 89-octane fuel. My question is whether 100% 85 octane gas is a better winter choice than 10% 91 octane gas for the RR? 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