I thought using alternative fuels meant lower gas mileage; how do alternative fuels really compare to gasoline and diesel?
The common method to understanding the amount of energy in different fuels is by comparing a unit of fuel with a gallon of regular unleaded gasoline by using a Gasoline Gallon Equivalent table. For example, if you can drive 25 miles on 1 gallon of regular unleaded gasoline, you would need to burn 1.5 gallons of E85 to go the same distance.