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I remember watching the video of the two trucks with the clear tubes mounted by the window pillar. One truck drove a slow steady rate, the other one drove fast. Eventually, the slow truck passed the faster truck because it still had gas to burn. It has to do with engine rpm, the load on the engine, and the resistance of keeping momentum. Every vehicle is different, and will have it's peak efficiency at a different point, but I think Bob is pretty close with 50-55 generalization for sake of argument.
Honestly though, if you drive like a maniac, you aren't going to drive properly just to save a buck, or the environment. You might do it for a week or two, but you will succumb to the accelerator eventually. Why do you think everyone wants to buy the car the little old lady drives?
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do it right, do it yourself. If that doesn't work, prepare to pay for your mistakes.
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