Drive more smoothly : Be gentle with your gas pedal and your brakes. There's no reason to speed up to a red light just to slam on the brakes. Aggressive driving will lower your gas mileage.
Slow down: Most vehicles get the best fuel efficiency at 45 to 55 miles per hour. Driving more than 60 mph can cut fuel efficiency 7 percent to 23 percent.
Reduce idling: Turn off your engine if you're waiting for more than 20 seconds. Idling wastes more gas than turning off your engine and restarting it.
Use lower-grade fuel: Regular unleaded fuel won't hurt most vehicles even if premium unleaded fuel is required. Unless your engine starts to knock or ping when using a lower-grade fuel, stick to regular.
Remove excess weight: An extra 100 pounds sitting in the trunk or back seat can reduce fuel economy as much as 2 percent.
Turn on the ventilator and turn off the air conditioning: The most efficient way to cool your car is with the air that comes in through your flow-through ventilator. Air conditioning or open windows (because of the drag) make your vehicle less fuel-efficient. Driving fast with the windows open can burn more fuel than the air conditioner.
Replace or tighten the gas cap: Fuel evaporates through gas caps with broken or weak seals, potentially reducing your car's mileage by 2 percent.
Keep the tires inflated: Tires that are improperly inflated have a higher rolling resistance, which reduces efficiency. Keeping tires at the proper pressure can improve gas mileage much as 3.3 percent.
Change the oil: Energy-conserving or synthetic motor oil can reduce engine friction, improving efficiency as much as 2 percent.
Replace the spark plugs: Misfiring spark plugs can reduce fuel efficiency as much as 30 percent
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