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      12-05-2012, 07:38 PM   #11

Drives: 135i
Join Date: May 2012
Location: Florida

iTrader: (0)

Originally Posted by Stohlen View Post
Except that you want to put in 30% ethanol, not 30% E85.

Gasoline is usually 15-20% ethanol, E85 is obviously 85%ish ethanol.

So estimating 10 gallons of fuel. You'd want to add 8.5 gallons of 93 octane and 1.5 gallons of E85. This would give you an estimated 29.75% ethanol content. Or E30 fuel.
E85 doesn't mean there is 85% ethanol in it, it means it can contain up to 85% ethanol. There is usually a disclaimer that states that E85 has a minimum of 70% though. This usually varies depending on the season (less ethanol during winter months).