Feb 16, 2013
Welcome to GasBuddy klw1963. That's a good question and as good a place as any to kick start your interest in gasoline and all of crude oil's complexities. Wikipedia has a lot of info about ethanol and this link http://en.wikipedia.org/wiki/Gasoline_gallon_equivalent states that it takes 1.5 gal of ethanol to compare to the same amount of energy in 1.0 gal of gasoline. Now this government link http://www.fueleconomy.gov/feg/ethanol.shtml states the situation in terms closer to the answer you'd like to know which is "vehicles will typically go 3–4% fewer miles per gallon on E10 than on straight gasoline." Here is a good link http://pure-gas.org/index.jsp?stateprov=MI to find 100% gasoline in your area (Michigan) but be prepared to pay more for it because you should see better gas mileage if you drive consistently. Personally I like to mix 100% gasoline with a top tier gas such as Shell or Chevron in order to maintain the fuel cleaning abilities of those products.