If you are doing everything in your power to increase your gas mileage, you have probably already factored in your tire pressure/gas mileage ratio, purchased your fuel-efficient tires and gotten a tun-up. But how do you accurately calculate the mileage you should be getting? If you aren't sure, try consulting the Fuel Economy Ratings website, which offers a wide range of helpful information, including a how-to on fuel economy, fuel-efficient tires, and best of all, a car comparison feature that lets you search for a vehicle's efficiency ratings by year, make and model.
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