I guess it comes down to your definition of "slightly". Avgas 100LL has even less energy-content per gallon than E10.
125,000 Btu/gal = 87 octane gasoline
121,000Btu/gal = E-10 gasoline
120,200 Btu/gal = Avgas 100LL
For 100-octane gas, it's still cheaper than VP T4 @ $12/gal or MRX02 @ $25/gal.
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