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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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