The EPA says that E10, a mixture of 90 percent gasoline and 10 percent ethanol used in most of the country, gets 3 to 4 percent fewer miles per gallon than straight gasoline because of the lower energy content of ethanol. If the pump price is the same for E10 and straight gas (or if E10 is higher), the straight stuff would be the better deal.
Most stations we stop at don’t offer a choice; it’s E10 or nothing. If you have a choice, compare prices and do the math to see which one gives you the most miles per dollar.
Complicating this issue is the fact that E15 (15 percent ethanol) is available at some stations, and it comes from the same pumps as E10. The pumps are supposed to have labels explaining this, but using E15 should reduce your mileage even more.
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