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      09-17-2012, 02:02 PM   #177
Drives: E92 335i
Join Date: Sep 2012
Location: USA

Posts: 443
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Originally Posted by JStang View Post
I am mixing 93 octane with E85. I put 5 gallons into my tank followed by filling up with 93 octane from Shell. 5 / 16.2 = 30.864%. I understand that 93 from shell contains "up to" 10% ethanol so maybe I have too much ethanol.

I assume that it is better to err on the side of too much ethanol versus too little, no?
Yeah, rather more than less. Your fuel trims look fine.
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