A perfect example is the Toyota Prius hybrid I have driven since last July. Toyota not only allows ethanol blends to be used in this car, but they strongly encourage it. The Prius has a 5 cycle Atkinson cycle engine that can adjust cylinder pressure to what ever the fuel octane will allow to get the best efficiency without detonation out of the avalible fuel. The static compression ratio of it's engine is 13/1, perfect for best efficiency of ethanol blended fuel. The whole theme of the Prius is top fuel economy, and it has a very accurate fuel milage computer. I have run it with pure 87 octane gasoline and with 89 Octane E10. Results over 5000 miles shows that the Prius makes a consistant 4 mpg better with 89 octane E10 compared to pure 87 octane gasoline. An engine runs on cylinder pressure, not just heat. The engines ability to produce the most gas expansion with a given fuel is more important than pure BTU's, as the Prius clearly demonstrates.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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