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5

In a perfect world from a physics textbook, you might be able to ask the question you have, and expect to compare time vs. engine speed, but there are many more factors in the real world. The speed-agnostic measure is Miles Per Gallon (or l/km). Speed doesn't appear in the name, because it doesn't matter. At higher speeds, things like wind resistance and ...


4

A lot of that depends on the type of vehicle, and your definition of 'fast'. Take this with a grain of salt, but a while back BBC's Top Gear did a test involving a V8 powered BMW M3 and a Toyota Prius. The Prius was driven as fast as it could go around their test track, while all the M3 had to do was keep up. After a few laps, the Prius had done ~18 mpg, ...



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