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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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