United States
US MPG Calculator
The US miles per gallon calculator measures fuel economy using the US gallon (3.78541 litres), the standard the EPA uses on every window sticker. Enter your miles and US gallons used and it returns your true MPG — the real-world figure that reflects your driving rather than a lab test.
The EPA rates city, highway, and combined economy separately, and this tool lets you label your result to match. As a highway miles per gallon calculator, you can drive a steady highway stretch, fill up, and read a pure highway figure — which is almost always higher than city MPG because steady cruising avoids the constant stop-start that drains efficiency in town.
The EPA reports the average fuel economy of new cars sold in the US is approximately 26–28 MPG combined. The most fuel-efficient non-electric vehicles achieve 50+ MPG. Alongside MPG, the calculator shows an annual fuel cost estimate, cost per mile, L/100km, and the UK MPG equivalent (which is higher) so you can compare against international specs.
How to Use
- Enter the miles driven.
- Enter the US gallons used.
- Choose the drive type to label your result.
- Optionally add a gas price for cost figures.
- Click Calculate US MPG (or press Enter).
Related tools: MPG Calculator, MPG Comparison Calculator, MPG to L/100km Converter, MPG Calculator Canada.
Got Questions?
US MPG Calculator FAQ
US MPG uses the smaller US gallon (3.785 litres). UK MPG uses the Imperial gallon (4.546 litres). The same car always has a higher UK MPG figure — about 20% higher than US MPG.
Highway MPG is the fuel efficiency measured at steady highway speeds (typically 55–65 mph in EPA testing). It is always higher than city MPG because highway driving avoids frequent stops and starts.
The EPA considers 30+ MPG combined good for a standard petrol car. Compact sedans often achieve 35–40 MPG. The most efficient non-EV cars exceed 50 MPG (primarily hybrids).
Drive a highway route, note your starting and ending odometer, fill up at the end, and divide miles driven by gallons used. Avoid including city segments in the fill-up for a pure highway reading.
The EPA-reported average for new 2023 model year vehicles is approximately 26.4 MPG combined. This has improved steadily from about 20 MPG in 2000, driven by fuel economy standards (CAFE).