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Yep fuel changes, temp changes, did that E10 tank go up more hills. Glad to see some data but road trips have way too many variables. E10(89) is always $0.10 cheaper here so used to be a clear choice, but 10 cents is a less than 3% cheaper now so choice isn't as clear as it used to be.
A couple months ago I was almost convinced E0 was giving me a extra 1-2 MPG, more recent data doesn't show any difference. At E30 self blends I only lost 10-11% mpg.
(but that data has limited value as my driving habits were still changing & car repairs)
My current data is a consistant as tank to tank as I can do, it is used for 95% commutting.
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