The MPG rating on a car’s window sticker comes from standardized testing, and real-world mileage is often a bit different depending on your driving style, terrain, and how much city versus highway driving you do. Our gas mileage calculator lets you calculate your actual MPG using the miles you drove and the gallons it took to refill your tank.
Tracking this over several fill-ups gives a far more reliable number than a single tank, since driving conditions and traffic vary from trip to trip. If your mileage is consistently lower than the manufacturer’s rating, it can point to a maintenance issue worth looking into, like underinflated tires or an overdue tune-up.
Once you have a dependable MPG figure, plug it into our fuel cost calculator to see what your actual driving costs per trip or per month, rather than relying on the manufacturer’s estimate.