Calculate your gas mileage (MPG) and fuel cost in one place. Enter your odometer start and end readings, gallons of gas used, and gas price per gallon to get your miles per gallon, total fuel cost, and cost per mile. Supports both US (miles/gallons) and metric (km/liters) units.
Fuel Efficiency
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Total Fuel Cost
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Cost per Mile / km
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Distance Traveled
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To calculate gas mileage, record your odometer reading when you fill up, then note the reading again at your next fill-up. Subtract the first reading from the second to get the distance traveled, then divide that distance by the number of gallons added at the second fill-up. The result is your miles per gallon (MPG).
A good MPG varies by vehicle type. For passenger cars, 30 MPG or above is generally considered good fuel efficiency. Hybrids often achieve 45–60 MPG, while SUVs and trucks typically range from 15–25 MPG. You can compare vehicles at fueleconomy.gov for a full breakdown.
You can improve gas mileage by maintaining proper tire inflation, avoiding aggressive acceleration and hard braking, reducing highway speeds, keeping up with regular engine maintenance, and removing excess weight from your vehicle. Carpooling, combining errands, and using cruise control on highways also help.
Yes, 4-wheel drive (4WD) vehicles are generally less fuel-efficient than front-wheel drive (FWD) or rear-wheel drive (RWD) vehicles. Powering all four wheels requires more engine effort, which increases fuel consumption, especially at higher speeds.
To convert US MPG to L/100km, divide 235.21 by your MPG value. For example, 30 MPG equals approximately 7.84 L/100km. Conversely, divide 235.21 by your L/100km figure to get MPG.
Fuel efficiency can vary due to driving conditions (city vs. highway), weather, air conditioning use, tire pressure, fuel quality, traffic, and driving habits. For the most accurate average MPG, track several fill-ups over time rather than relying on a single measurement.
According to the American Automobile Association (AAA), the average American driver spends approximately $3,000 per year on gasoline. This varies widely based on vehicle fuel efficiency, annual mileage, and local gas prices.
Yes, under-inflated tires increase rolling resistance, which forces your engine to work harder and burns more fuel. Keeping your tires inflated to the manufacturer's recommended pressure can improve fuel efficiency by up to 3%. Check your tire pressure monthly, especially during temperature changes.