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I have heard of lower % blends getting better mpg never tested that myself. Its kind of like how it doesn't take mixing in a lot biodiesel before emissions drastically improve.
When you say you had to modify the fuel pump to run E85 was that for the same reason op installed bigger injectors?
Also on a kind of related topic. I ran an old Briggs and straton engine on ethanol and only thing I did was close down the choke to change the air to fuel ratio. Engine ran great. Didn't like cold starting much below 50deg though.
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