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Make sure tires are properly inflated - When tires aren't inflated properly, it's like driving with the parking brake on and can cost a mile or two per gallon.
Replace spark plugs regularly - A vehicle can have either four, six or eight spark plugs, which fire as many as three million times every 1,000 miles. That results in a lot of heat and electrical and chemical erosion. A dirty spark plug causes misfiring, which wastes fuel. Spark plugs need to be replaced regularly.
Replace dirty air filters - An air filter that is clogged with dirt, dust and bugs chokes off the air and creates a "rich" mixture-too much gas being burned for the amount of air, which wastes gas and causes the engine to lose power. Replacing a clogged air filter can improve gas mileage by as much as 10%.
Don't be an aggressive driver - Aggressive driving can lower gas mileage by as much as 33% on the highway and 5% on city streets.
Avoid excessive idling - Sitting idle gets zero miles per gallon. Letting the vehicle warm up for one to two minutes is sufficient.
Observe the speed limit - Gas mileage decreases rapidly at speeds above 60 mph. Each mile driven over 60 will result in an additional 10 to 34 cents per gallon. To maintain a constant speed on the highway, cruise control is recommended.
Some of the statistics were gathered from a U.S. Department of Energy website: www.fueleconomy.gov
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