What speed burns the most gas?
What speed burns the most gas? While vehicles reach optimal fuel economy at different speeds, gas mileage usually decreases rapidly at speeds above 50 miles per hour (mph). For light-duty vehicles, for example, every 5 mph you drive over 50 mph is like paying $0.30 more per gallon of gas (based on the price of gas at $4.32 per gallon).
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