Don't top off the gas tank. Too much gas will just slosh or seep out. Why waste those extra pennies
if you are really worried about getting the best MPG...
Keep your tires inflated properly. This one is simple and a potential lifesaver. Underinflated tires waste fuel and wear out the tire tread. Also, check tires regularly for alignment and balance.
A well-tuned engine burns less gas. Get regular tuneups and follow through with routine maintenance. The right parts and fresh oil keep your engine happy and less thirsty for gas.
Get the junk out of the trunk. A weighed-down car uses more fuel. For every extra 250 pounds your engine hauls, the car loses about one mile per gallon in fuel economy. Carry only the basic emergency equipment and items you really need.
Drive intelligently; don't make fast starts or sudden stops. You're just overexerting your engine and burning extra fuel. Gradual acceleration also helps automatic transmissions run better. Engine-revving wastes fuel, too.
Lighten up on the accelerator. The faster you drive, the more gas you use. Speed limits have gone up around most of the nation, but you don't have to see your fuel consumption go up drastically as well. For example, driving at 55 mph rather than 65 mph can improve your fuel economy by two miles per gallon.
Avoid long warm-ups. Even on cold winter mornings, your car doesn't need more than a minute to get ready to go. Anything more and you're just burning up that expensive fuel.
Tighten up that gas cap. Make sure it's on securely. Buy a new one if your current cap doesn't fit snugly. Gas easily evaporates from the tank if it has an escape.
Be smart with the air conditioning. On the highway, closed windows decrease air resistance, so run the air conditioner. But in stop-and-go traffic, shutting off the air conditioning and opening the windows can lighten your fuel use. Air conditioning can lower your fuel economy by 10 percent to 20 percent
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