Yes, power and efficiency compromised - but if fuel is 1/2 price (homemade), how much compromise are you willing to endure?

Many places in US are now 'minimum' 10% ethanol in gasoline, the higher octanes may be even more. All subject to change as the subsidies are gradually eliminated - then change again when they figure out how to make ethanol cheaper...

So what about a vehicle 'modified' to burn alcohol fuel? Is there just that much less energy per gallon?