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Flex-fuel vehicles became all the rage a few years back, because automakers get special credits toward federal fuel-economy standards. Because the credits are weighted toward bigger “footprint” vehicles like pickups and SUVs, you see a lot of U.S.-made “Big Three” (Ford, FCA [Fiat-Chrysler],...

Flex fuel gas mileage tends to be somewhat less than standard gasoline mileage. Although if you were to look at the advertising, it would appear that the mileage is the same. About the only thing that is the same or better is the octane rating, as ethanol does raise the octane level.

A flexible-fuel vehicle (FFV) or dual-fuel vehicle (colloquially called a flex-fuel vehicle) is an alternative fuel vehicle with an internal combustion engine designed to run on more than one fuel, usually gasoline blended with either ethanol or methanol fuel, and both fuels are stored in the same common tank.

How E85 Ethanol Flex Fuel Works. About half of these E85 ethanol flex-fuel vehicles are in commercial or government fleets. The majority of private E85 vehicles come from Ford and General Motors, but certain Chrysler, Dodge, Jeep, Mercedes-Benz and Nissan models also are E85 ethanol-compatible.

Flex-fuel Vehicles. Flexible fuel vehicles (FFVs) are designed to run on gasoline or gasoline-ethanol blends of up to 85% ethanol (E85). 1 Except for a few engine and fuel system modifications, they are identical to gasoline-only models. FFVs experience no loss in performance when operating on E85, and some generate more torque...

Source. Flex fuel, also called E85, is an alternative fuel that is 85% ethanol and 15% gasoline. This blend of ethanol and gasoline creates a new fuel that’s more sustainable and eco-friendly than gasoline alone. Flex fuel burns cleaner than gas, so it releases fewer carbon emissions into the atmosphere.

Flex fuel vehicles have larger fuel pumps and injectors due to the lower energy density qualities of high ethanol mixtures Corrosion/deterioration resistant fuel pumps, fuel lines, fuel injectors, and the fuel tank Cylinders, pistons, valves, and other internal engine components are coated in a special material...

SEE ALSO: 14 Most Fuel-Efficient Cars. E85, or flex fuel, is a blend of 85% ethanol and 15% gasoline that can be used in vehicles specially designed to run on it – as well as regular gasoline. There are more than 10.6 million flex-fuel vehicles on the road, according to the U.S. Energy Information Administration. You might even be driving one and not realize it.

How E85 Ethanol Flex Fuel Works. Burn E85 -- a blend of 85 percent of the alcohol-based fuel ethanol and 15 percent gasoline, which American automakers flaunt as their latest alternative-energy idea -- and the Impala's EPA numbers shrivel to 16 mpg city, 23 highway.

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.

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