Truths vs. myths about how to save on gas

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<b>FACT:</b> Know your numbers<br> <br> To improve mileage, you have to know what your current miles-per-gallon usage is. Simply computing how many miles you get to a tank is too imprecise. First, find out what sort of mileage you should be getting. Go to fueleconomy.gov -- the Environmental Protection Agency has recalculated mileage on cars back to 1985.

Fact

(AFP/Getty Images / May 3, 2008)

FACT: Know your numbers

To improve mileage, you have to know what your current miles-per-gallon usage is. Simply computing how many miles you get to a tank is too imprecise. First, find out what sort of mileage you should be getting. Go to fueleconomy.gov -- the Environmental Protection Agency has recalculated mileage on cars back to 1985.