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Proper inflation equals better mileage.
Randy Janoski Only about 15 percent in each gallon of gasoline in your car's tank actually moves it down the road. The other 85 percent burns to overcome wind resistance and friction in the mechanical system. Maximize that 15 percent with a few simple tips offered by Ken Katz, an engineer with the National Highway Traffic Safety Administration, to get the best possible mileage from your vehicle. Maintain your car . Regular tuneups are vital for top fuel economy.