We know ethanol is c. 30% less energy dense than gasoline so we will lose some mpg, all else equal.
Starting with 100% gasoline, you should expect to lose 1.5% MPG if you substituted a 95:5 gasoline/ethanol mix, or 3.0% if you went to 90:10.
E10 might not contain 10%, it must contain between 5% and 10%. Same with E5, mutatis mutandis.
E.g. it's reported that Esso Synergy Supreme (E5) has 0% ethanol in some regions.
The question is whether you can measure 3% difference or less, or if that is lost in the noise when you try to compare one tank with another.
That might be modified a bit if the engine is more or less better at achieving complete combustion on a different blend.
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Ford - E5 vs E10 fuel new
Ford - E5 vs E10 fuel new
