If you slow a car from 57 to 50 miles per hour (91 to 80 kph), you will get half again better gas mileage. This means that the average American driver would save about $300 per year.
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If you slow a car from 57 to 50 miles per hour (91 to 80 kph), you will get half again better gas mileage. This means that the average American driver would save about $300 per year.