Miles Per Gallon
Calculator
Results
- Miles per gallon (US)
- 26.666666
- Miles per gallon (imperial)
- 32.025331
- Consumption (L/100 km)
- 8.820546
- Kilometres per litre
- 11.337165
Results
| Miles per gallon (US) | 26.666666 |
| Miles per gallon (imperial) | 32.025331 |
| Consumption (L/100 km) | 8.820546 |
| Kilometres per litre | 11.337165 |
formula-map diagram
- Miles per gallon (US)
- 26.666666
- Miles per gallon (imperial)
- 32.025331
- Consumption (L/100 km)
- 8.820546
- Kilometres per litre
- 11.337165
Formula breakdown
Formula
MPG = miles ÷ gallons= 26.666666666667
Note
Simplified model: results use idealised textbook relationships and ignore real-world factors such as driving style, load, temperature, aerodynamic and rolling losses, drivetrain efficiency, tyre and brake condition and road surface. CO2 figures are tailpipe only, based on the standard 2.31 kg CO2 per litre of petrol (2.68 kg per litre of diesel), and exclude fuel production and distribution. Use them as estimates, not as legal, safety or load-rating figures.
More in Automotive and transport
See all →Frequently asked questions
What does MPG measure and why does a higher number mean better efficiency?+
Miles per gallon measures how far a vehicle travels per unit of fuel consumed, so more miles per gallon means the vehicle needs less fuel to cover the same distance — higher is better, the opposite convention from L/100km.
How is MPG calculated from a fill-up?+
MPG = miles driven ÷ gallons of fuel used. If you drive 300 miles and use 10 gallons to refill the tank to the same level as before, your MPG for that tank is 300 ÷ 10 = 30 MPG.
Why is US MPG different from UK/Imperial MPG for the same vehicle?+
A US gallon (3.785 liters) is smaller than an Imperial gallon (4.546 liters) used in the UK and historically elsewhere, so the same vehicle reports a higher MPG figure in Imperial gallons than in US gallons for identical real-world fuel consumption — always check which gallon definition a figure uses before comparing.
What's a common misconception about improving MPG at higher values?+
Because MPG is inversely related to fuel consumed, an improvement from 40 to 50 MPG saves much less fuel over a fixed distance than an improvement from 15 to 20 MPG, even though both are 5-10 MPG gains. This is why fuel savings are better judged in gallons-per-mile or L/100km terms when comparing vehicles at different efficiency levels.
What's a common mistake when calculating MPG from a fill-up?+
Not filling the tank completely to the same level both times, or including a partial tank of unknown fuel level in the calculation. For an accurate MPG figure, always calculate from a full tank to a full tank, resetting the trip odometer at each fill-up.