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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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