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prob a little late now...but make sure your truck is flex fuel compatible ...and mpg prob isnt the best comparison to gauge e85
if youve got a light foot and/or do a lot of highway mileage youll prob break even compared to 87oct.
with the stock tune i only ran 93oct, the e85 would keep up with it for highway mpgs and on cruise control climbing grades it would do better. going from 87 to e85 in performance though will prob rock but counterproductive to trying to save money