The MPG number on a car’s window sticker is based on standardized testing, and real-world fuel economy is often a bit different depending on your driving style, terrain, and how much city versus highway driving you do. This car fuel economy calculator lets you calculate your actual MPG by entering the miles you drove and the amount of fuel it took to refill your tank. Tracking this over a few fill-ups gives you a more reliable number than a single trip, since driving conditions vary from tank to tank.
Once you know your real MPG, you can use it to get a more accurate estimate from our car fuel cost calculator instead of relying on the manufacturer’s figure, which tends to run higher than what most drivers actually see. If you’re noticing your fuel economy is consistently lower than expected, it’s also worth factoring that into your total cost of ownership estimate, since fuel is one of the largest ongoing costs of owning a car.