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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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