It seems all engines are not equal in their ability to gain from the higher octane of the ethanol blends. It seems the higher compression ratio, the better efficiecy they get from high octane E blends. Odd thing is that a non flex fuel engine often makes better MPG on an E blend than a FFV engine with more conservative mixture and ignition settings. I suspect a non FFV engine running on an E30 or stronger blend runs a bit on the lean side which helps it make better mpg.
An interesting thing is that my Hybrid car with a 13 / 1 compression ratio Atkinson cycle engine, actually makes better MPG on 89 or 90 octane E10 than it does on 87 octane pure gasoline. By BTU count alone, E10 has 3% less btu than pure gasoline, but it aparently gains enough efficiency from the 3 points higher octane to offset the heat loss with higher conversion efficiency when making cylinder pressure from the avalible heat.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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