The reason you get lower
fuel efficiency with E10 than with the older MTBE-formulated gasoline is simple... Ethanol is an
fuel oxygenator, since all alcohols have an OOH group on one end. This means that the fuel will burn slightly cleaner... but it will also reduce fuel efficiency,
since you're now paying for oxygen in your fuel. Any space taken up by oxygen in the fuel is going to reduce the energy content of the fuel since, previously, the oxygen was all free... it came from the air the engine aspirated. 
Quote:
Originally Posted by blt2ski
I do nto personally like E10, one of my trucks gets 10MPG with straight gas, 8 with E10, so for every 100 miles I drive, I use 10 Gals of straight gas, and with E10, just under 11 gals of straight gas and 1.5 gals of ethanol! Makes sense does it not?!?!? NOT! This is supposed to remove our dependence on foreign oil?
oops. sorry about the political rant!
Marty
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__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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