2004 V6 MPG Nosedive
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Now having said that, E10 is not good, it is/was pushed along side "global warming" to make the Earth happy. You say 2-3mpg boost in mpg? 10% of 20mpg is 2mpg. That's the amount of ethanol in your gas. New engines usually pull timing (retard) in order to run 87 with E10. Theoretically, it should run the same timing as 100% gas, but it doesn't. Less timing=less power.
If your Premium is more than eh 15% more expensive, don't buy it. If it is less than say 10% more, buy it. If it is in the middle, you be the judge. That is assuming your Premium is 100% gas, if it is E10, buy 87. If the mid grade gas doesn't contain ethanol, and the other two do, buy the mid.
Cliffnotes:
Always buy 87 if it is 100% gasoline. Buy 87 E10 if both 87 and Premium contain ethanol. Buy Premium when it is <12% more than 87 (assuming the 87 is E10 and the Premium is 100%)
Baby cliffnotes:
Avoid ethanol. If you have no choice, buy E10 87/Regular.
Last edited by MadisonDakota; 03-15-2010 at 01:10 PM.
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decent explanation of octane here: http://www.answers.com/topic/petrol
- miggity
Last edited by miggity; 03-16-2010 at 07:57 PM. Reason: even spell check couldn't save this one