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I've linked it before, I don't know if it's still here, but I found a university study that agrees with my ethanol experiences, and that is with up to 40% ethanol blends, several models of cars tested did not experience any fe drop, or it was negligible, and in fact one got better fe.
I generally figure my fe is unchanged by mixes of E85/regular up to 50/50 and above that, yes, the fe drop becomes noticeable.
And of course there is the basic hypermiling technique of short shifting and going deep into the throttle, which I think needs no further explanation here.
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