Does ethanol get less mileage than gasoline?
Yes, a gallon ethanol has 2/3 the energy content than that of gasoline. To travel the same distance provided by a gallon of gasoline, it would take 1.03 gallons of E10 and 1.33 gallons of E85. In today’s engines, automobiles using E85 typically see a mileage decrease of 10-20%, depending upon the vehicle.