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      12-05-2012, 05:54 PM   #9

Drives: AW 135i
Join Date: Aug 2012
Location: Waterford, Mi

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2008 BMW 135i  [2.83]
Originally Posted by DRedman45 View Post
fuel capacity is 14 gallons, plus there is always more due to the filler neck so i will use 14.5 gallons

30% of 14.5 (14.5x.3) is 4.35 gallons of ethanol and 10.15 gallons of 93
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.