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      12-05-2012, 07:05 PM   #13
brusk
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Drives: 2008 135i Coupe
Join Date: Jan 2012
Location: Cleveland, TN

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Here's a method similar to how I test my mixture after siphoning some out of the tank.



Unfortunately in my limited research I've found that stations in Dallas the Ethanol content of my 93 is 1-12% out of 5 stations I've tested. I have limited access to E85 so I store it in a 30 Gallon container in my garage. Since E85 can really be between 70-90% Ethanol (mine tested out at 89%) and gas can be vary I would suggest at least testing the stations you regular fill up at. I use a similar calculator as gdub already mentioned to get close and then do a final check of whats in the tank after driving around for 15-20 minutes to get the mixture mixed up real nice.
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2008 135i - Cobb/JB4, Spec 3+ Clutch/Flywheel, MS DP's, Berk street exhaust, AMS IC, UI CAI, CDV delete, Quaife LSD, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.