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The non-ethanol gasoline was a let-down. No change noticed.
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energy content
ethanol HHV = 84,000 Btu/gallon
gasoline HHV = 125,000 Btu/gallon
The energy content of E10 is approximately
(.10 x 84,000) + (.90 x 125,000) = 8400 + 112,500 = 120,900 Btu/gallon
This is a loss of
125,000 - 120,900 = 4100 Btu/gallon or 3.28 percent
To accurately determine the loss, you would need to run a tank of E10 and a tank of straight gas over the same route with the same driving style. I have done that with several vehicles on round trips on Hy 40 between Los Angeles and Albuquerque, starting with full tanks of California E10 and fueling again with straight gas in eastern Arizona.
The numbers don't lie.