If you are really concerned about fuel I suggest you go to this website:
Home | Top Tier Gas
Read everything and then think about what brand of gas you want to buy, there is a difference!
Straight gasoline has 114,500 btu's per gallon, ethanol E85 has 81,800 btu's per gallon. Bottom line is the more ethanol you add to gasoline the less thermal energy is produced whic means less power and miles per gallon of fuel.
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