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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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