Gas Mileage Calculator
Calculate your actual fuel economy from distance driven and fuel used. Converts between MPG, L/100km, and km/L.
MPG Reference — Typical Vehicle Classes
| Vehicle Type | City MPG | Highway MPG | L/100km (hwy) |
|---|---|---|---|
| Compact car | 28–35 | 38–45 | 6.2–5.2 |
| Mid-size sedan | 22–28 | 32–38 | 7.4–6.2 |
| Full-size SUV | 14–18 | 20–26 | 11.8–9.0 |
| Pickup truck | 14–20 | 19–26 | 12.4–9.0 |
| Hybrid sedan | 45–55 | 48–58 | 4.9–4.1 |
Frequently Asked Questions
How do I calculate MPG?
MPG (miles per gallon) = Miles driven / Gallons used. To measure accurately: fill your tank completely, reset your trip odometer, drive normally, then fill up again. Note the miles driven and gallons pumped. Example: 350 miles driven on 12 gallons = 350 / 12 = 29.2 MPG.
What is a good gas mileage?
In 2025–2026, average new car fuel economy in the US is around 27–30 MPG combined. Compact cars: 32–40 MPG. Mid-size sedans: 26–32 MPG. Large SUVs / trucks: 16–22 MPG. Plug-in hybrids: 50–80 MPGe. The EPA rates vehicles — see fueleconomy.gov for comparisons.
How do I convert MPG to L/100km?
Use the formula: L/100km = 235.215 / MPG. Examples: 25 MPG = 9.4 L/100km; 30 MPG = 7.8 L/100km; 40 MPG = 5.9 L/100km. Conversely, MPG = 235.215 / (L/100km).
Why is my gas mileage lower than the EPA estimate?
EPA estimates are based on standardised lab tests. Real-world mileage is typically 10–20% lower due to: city driving with frequent stops, highway speeds above 55 mph (aerodynamic drag increases exponentially), air conditioning, cold weather (increases friction and increases warm-up time), and cargo weight. Tyre pressure below recommended levels also reduces efficiency by 0.2% per PSI.
How can I improve my gas mileage?
Key improvements: maintain correct tyre pressure (+0.5–3% efficiency per 10 PSI), reduce highway speed (best efficiency is typically 50–60 mph), avoid idling, use cruise control on motorways, remove roof racks when not in use, and switch to synthetic motor oil. Gradual acceleration and coasting to stops also help significantly.