I did some experimenting last month.
2 about E30 tanks averaged about 28.4 mpg at $3.00 a gallon (2.59 E85, 3.45 E10) about $0.105 per mile.
2 tank average on E0 = 31.97 mpg and $0.111/mile
3 tanks average on E10 = 31.3 @ 3.60 gallon = $0.115/mile
Gas & E85 has gone up since the first blended tanks so I should normalize it to a single days prices. But either way cost per mile is pretty much the same for my 1998 Stratus.
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