e85 fuel is fairly available to me. I've never used it before (my truck is flex fuel), but 'they' say it gets 10% less fuel economy but has an octane rating of 100-105. With a tune, are you able to make up that 10% loss since you can tune for the higher octane? how much more power do you think you can tune for between an 87/91 gas tune vs the 100-105 e85 tune?
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