Gas mileage decreases rapidly above 60 miles per hour, and if you drive 70 mph instead of 55 mph you could lose up to 17 percent of your car's fuel economy — which is how many miles a vehicle actually drives using a given amount of gas on either the highway and in the city. In fact, each 5 mph you drive over 60 mph is equal to paying an additional $.10 per gallon of gas. To maintain the speed limit and save gas, try using cruise control (if you have it) or just stick to the limit.
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