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Originally Posted by Evil One
I mess with turbo engines... ethanol and E85 are a godsend.
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If you want maximum power output, yes. Otherwise, no. There are fewer BTU's in a gallon of ethanol than gasoline.
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More boost and more timing without detonation.
You guys just are not carrying enough combustion pressure. 
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Most of us have no control over that.
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As to diesel... buddy of mine has a 1st gen dodge cummins with 3.07 gears and a 5 speed. Gets 28-30 mpg average on the hiway @ the speed limit with a best of 32.
I will take that kind of fuel economy with the ability to work it nice and hard.
Jim
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I have found that a lot of times what people say they get for mileage and what they actually get are two different things. Not that they are deliberately lying, but if you just read a number off the trip computer, that isn't necessarily the true mileage you are getting. For instance, if I reset the trip computer at the top of Pike's Peak and then check my mileage at the bottom, I'll be able to report, truthfully, some very high numbers.
I've got a 3rd generation Cummins--22mpg, 90% empty, driven like the old man that I am. I know the first generations will do better, but not 45% better.