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E-85 is a flexible fuel, which contains a mix of 85 ethanol, produced from corn, and 15 gasoline by volume. It has a higher octane value than normal gasoline, but must be used by only flexible fuel vehicles. There are currently over 2000 fueling stations that provide E-85.

The amount of money you can save by switching to E-85 depends entirely upon the fuel efficiency of the car you drive, the cost of a gallon of normal gasoline, and the cost of a gallon of E-85. The fuel efficiency of your car will differ for both normal gasoline and E-85. The best way to figure out how much gas money you will save is by calculating the cost of gasoline per mile. To do this, divide the fuel efficiency by the cost of a gallon for each type of fuel. For instance, suppose your fuel economy is 31 mpg using normal gasoline and 26 mpg using E-85 fuel, and a normal gallon of gas costs 3.86 and E-85 costs 3.09. Normal gasoline would cost you 12.5 cents per mile and E-85 would cost 11.9 cents per mile. For a 400 mile trip, that is a 2.40 savings by using E-85.

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