A flex-fuel vehicle running on E85 pollutes less but will generally get around 30 percent worse fuel … Most flex-fuel vehicles can use flex-fuel and regular gas, and it doesn’t matter if you mix it up. Flex fuel vehicles are therefore not the same as bi-fuel vehicles, which have separate tanks for each different fuel type they use. You have the questions, The Drive has the answers! When i use E85, truck runs like a bull, but purrs like a kitten. Drivers can alleviate this in two ways. Can You Use Regular Gas In a Flex Fuel Vehicle? 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. Because e85 already is a mixture of 85 percent ethanol and 15 percent gasoline, it is just fine to mix the two fuels. 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. However, if your car has a traditional gas cap and doesn’t have an E85 label, you should not put E85 in your vehicle. Flex Fuel FAQs. E85 is a blend of 85 percent ethanol and 15 percent gasoline. Some cars, labelled as flex-fuel vehicles or FFV can … Cars.com reports that flex-fuel vehicles are capable of running on both ethanol-gasoline blends and regular gasoline. Flex fuel vehicles normally run on a mixture of either ethanol or methanol and gasoline. Flex-fuel vehicles are usually similar in appearance to traditional cars. Flex fuel vs. Reg gas 5 Answers. Flexible Fuel Vehicles look and drive just like regular gasoline-only vehicles, but have been built with special components that are compatible with E85. What Happens When You Put E85 in a Gasoline Car? FFVs, as they’re known, can run on gasoline or any blend of gasoline and up to 85 percent ethanol. 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. E85 is a fuel that has a much higher blend of ethanol. 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, as duel fuel vehicles, have an internal combustion engine capable of functioning with a mixture of fuels. 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. Some gasoline-powered vehicles (known as flex-fuel vehicles) can also run on E85; they usually have a bright-yellow fuel cap. 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