Fuel Economy FAQ
These answers cover the questions drivers ask most about MPG and fuel cost. The calculators on this site apply standard formulas; your real numbers depend on your driving.
Frequently Asked Questions
What is the most accurate way to measure my MPG?
Fill the tank to full, reset the trip odometer, drive normally, then refill to full and divide the miles driven by the gallons it took to refill.
Does highway or city driving get better MPG?
Most cars do better on the highway; hybrids are the exception and often shine in the city because they recapture braking energy.
How much can tire pressure affect MPG?
Under-inflated tires raise rolling resistance and can cut MPG by a few percent. Keeping them at the recommended pressure is one of the cheapest gains.
Is it worth buying a more efficient car?
Run the two-car comparison with both MPG figures and your annual miles. The yearly fuel saving shows whether the price difference pays off for your driving.