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First of all, check your gas cap! Believe it or not, it’s been estimated that nearly 17% of cars on the road have broken or missing gas caps. What’s the big deal? Escaping fumes not only hurt fuel economy but release smog-causing compounds into the air.

While you’re at it, slow down. For every 5 mph you reduce highway speed, you can reduce fuel consumption by 7%. Avoiding jack-rabbit starts and stops will improve fuel economy as well. Don’t believe it? Lousy driving on the highway can add as much as one-third to your gas bill.