^ yes.
That optimum speed depends very much on the car, though. On my two Hondas, a civic and an odyssey, the best speed is respectively 15 mph and 8 mph.
Lighter wheels help too - unsprung weight has a hard time going over bumps smoothly.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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