Truths vs. myths about how to save on gas
Image 1 of 5
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.