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From a performance point of view, people use turbos to increase power on an engine. The turbo does in some ways 'increase compression ratio', due to it increasing the amount of air entering the cylinder. This larger amount of air will now be compressed in the same size as the non turbo version, so in that sense, there's a higher compression.
It's much easier to increase power on an engine than increase compression.
Or even reducing airflow, by creating a hot air intake for better mileage.
But increasing compression, by reducing the gasket thickness, or possibly creating a smaller cylinder head; I haven't seen a lot of people do.
Despite the results,
Ethanol still remains a lower density fuel, attracts water vapor (which increases torque but eats HP) and overall water is even less energy dense than ethanol.
On average, an E85 blend has about 30% less energy than 87 octane fuel.
In order for you to match the same power output, you'd have to give the engine 30% more fuel (on E100), or,...
There is a possibility that with an increased compression ratio, you do get away with less fuel, and get the same mileage as gasoline.
That is, if you can get 30% more compression without any issues (like knock, ping...).
In theory it would work, going from 11:1 to 14.3:1.
In practice, as far as I know, it's never been done before.
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