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Been playing with E blends in Cobalt, using indicated mpg instead of calculated cause I don't fill at the same station or top off the same. E10 tank a few weeks ago indicated 44.6 @ 47 mph average. (that was the highest E10 of recent so a little of an outlier).
E30/94 octane indicated 41.3 @ 47 mph. E45/98 octane 40.2 mpg @ 47 mph. Based on energy content E30 should give about 93% of E10 or 41.5 mpg, E45 87% or 38.8 mpg.
Disclaimer: I did replace a rear tire after the E10 tank and did a smaller front tire test in between. Smaller tires give a 2 mpg increases in indicated MPG, calculated as no change. The test was cut short due to tire failure.
E10 about 97% of E0 energy.
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