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10 Ways to Save Gas & Money
1) Slow and steady wins the race
Gasoline mileage drops off in most cars once you're going faster than about 60 mph (see chart at left). For every 5 mph you drive over 60 mph, you're essentially paying an extra 24 cents per gallon of gas.
Try using cruise control on interstates and other highways to maintain a constant speed. It can also help to use your car's overdrive gears, which save fuel and engine wear by reducing your speed.
2) Be cool in traffic
Aggressive driving — speeding, swerving, sudden acceleration and braking — is not only dangerous, it can lower your gas mileage 33 percent on highways and 5 percent on city streets. Revving your engine while stopped is even more wasteful.
3) But not too cool
Air conditioning can be a big drain on gasoline, so make sure you don't just leave it on absentmindedly, and certainly don't leave it on while windows are open, even if they're just cracked. You can improve your fuel efficiency in stop-and-go traffic by turning off the A/C and rolling down the windows instead, but that's not necessarily always the best idea.
When driving above 55 mph, especially for long periods on highways, the opposite is true — open windows make a vehicle less aerodynamic by letting in air, which increases air resistance and decreases fuel efficiency. On long road trips, using air conditioning could actually improve your mileage by up to 20 percent.