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The problem is that you can build an engine to be optimal with E85 or you can build it to be optimal on gasoline. When you have to go back and forth is when you lose in both areas. EFI tuning can take up a lot of slack in both areas, but some of the basic differences are cam timing, compression ratio and injector sizes.
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Jim Allen
The Frugal Four Wheeler and Farmer
My ultimate goal is not necessarily the highest mpg but to make my trucks more efficient configured as I need them.
Old Reliable '86 Ford F-250HD 4x4, 6.9L diesel
Red '00 Honda Accord Coupe, 3.0L V6, automatic
The Plugger '05 Ford F-150HD 4x4, Regular Cab, 8-ft bed, 8,200# GVW, 5.4L V8, automatic, 4.10:1 ratios, 285/70R-17D tires
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