Originally Posted By: Cujet
Modern vehicles will compensate properly for ethanol content. So, the MPG loss is very closely tied to loss of energy content. With 10% ethanol content resulting in roughly 3% MPG reduction.
I test ethanol content from time to time, using a test tube and titrating pipettes (as accurately as I can, which I will admit is not perfect) It is often around 5% here. But, I did recently get a batch with 10% ethanol, that much ethanol is rare.
So, a loss of 1.5% MPG is more normal around here.
Also, the non ethanol gas runs VERY well in outdoor power equipment. But, the ones I have, employ carburetors. BUT, it still may not have the energy content of real gasoline in the past.
Check out this table about gasoline energy content:
http://en.wikipedia.org/wiki/Gasoline_gallon_equivalent
Excellent, truth with fact instead of knee-jerk.