FFVs, as they’re known, can run on gasoline or any blend of gasoline and up to 85 percent ethanol. I have a 2011 F150 5.0 Flex fuel. What Happens When You Put E85 in a Gasoline Car? Flex fuel vehicles normally run on a mixture of either ethanol or methanol and gasoline. Some cars, labelled as flex-fuel vehicles or FFV can … E85 is a fuel that has a much higher blend of ethanol. FFVs have an engine control computer that recognizes the mixture of fuel so the ignition timing and fuel flow rate can be optimized for the fuel mixture being used. There are recent models that have been designed to work with ethanol-gas mixtures up to a certain point or FFV (Flex Fuel Vehicle) that can run with any blend up to E85, but still use caution unless your vehicle warranty specifically states that you're covered in the event of damage related to E85. Flex fuel vehicles are therefore not the same as bi-fuel vehicles, which have separate tanks for each different fuel type they use. Flex Fuel FAQs. Some pumps are labeled as E85. Cars.com reports that flex-fuel vehicles are capable of running on both ethanol-gasoline blends and regular gasoline. E85 is a blend of 85 percent ethanol and 15 percent gasoline. Flex-fuel vehicles are designed for this mixture of 85 percent ethanol and 15 percent gasoline: Other grades of gasoline are typically 10 percent ethanol unless marked, according to PopularMechanics.com. Flex fuel vs. Reg gas 5 Answers. Flex fuel vehicles, as duel fuel vehicles, have an internal combustion engine capable of functioning with a mixture of fuels. The wisdom was … Most flex-fuel vehicles can use flex-fuel and regular gas, and it doesn’t matter if you mix it up. A flex-fuel vehicle running on E85 pollutes less but will generally get around 30 percent worse fuel … Flexible Fuel Vehicles look and drive just like regular gasoline-only vehicles, but have been built with special components that are compatible with E85. The answer is that e85 can be mixed with regular gasoline in flex-fuel vehicles. First, consider driving the vehicle a long distance to use up the fuel as quickly as possible. However, if your car has a traditional gas cap and doesn’t have an E85 label, you should not put E85 in your vehicle. Because e85 already is a mixture of 85 percent ethanol and 15 percent gasoline, it is just fine to mix the two fuels. You have the questions, The Drive has the answers! If you accidentally fill a non-flex-fuel 2001 or later vehicle with E85 once, nothing bad will typically happen, except fuel mileage will suffer. Most FFVs can run regular gasoline, but always read the vehicle … Can You Use Regular Gas In a Flex Fuel Vehicle? When i use regular gas, I hear valves … In the 2008 US election season, politicians and the chattering class were all aflutter debating the merits of mandating that all US automakers produce only flexible fuel vehicles. 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