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Oddly enough, it's at about 52 MPH. The engine isn't "lugging" and the speed isn't high enough to cause excessive wind drag. But since most people are not content with a slower speed, the best thing they can do is try to keep a very constant speed on the open highway - set the cruise control at, say, 72 MPH. Most of your sightseeing buses stipulate that as their maximum speed. In that manner, you are not constantly on someone else's tail, but not so fast that you can't be passed.

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Q: What is the most economical speed for a car?
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