MPG Calculator

Calculate your vehicle's fuel efficiency in MPG (Miles Per Gallon)

How to Use This Calculator
Measuring Your Vehicle's MPG
  • Fully fuel your vehicle.
  • If your car has a trip meter, reset it. Otherwise, note your current odometer reading.
  • Drive as you normally would until your next refuel.
  • At the petrol station, completely fill your tank again and record the amount of fuel added (in litres).
  • After refueling, note the reading on your trip meter.
  • Use these figures in our calculator to determine your car's MPG, litres per 100km, and kilometres per litre.
Why you should care
Financial Benefits

Understanding your vehicle's fuel economy can save you significant money over time. A car with good MPG (40+ UK MPG) could save you £500-£1,000 annually compared to an inefficient vehicle. For a typical driver covering 12,000 miles yearly, even a 5 MPG improvement can save over £150 annually at current fuel prices.

Environmental Impact

Fuel-efficient vehicles produce fewer carbon emissions. Each gallon of petrol burned produces about 10kg of CO2. Improving your MPG by just 5 miles per gallon can reduce your carbon footprint by approximately 1-2 tonnes of CO2 per year, equivalent to planting 50 trees.

Vehicle Performance & Longevity

Poor fuel economy often indicates underlying mechanical issues. Monitoring your MPG can help detect problems early, potentially avoiding expensive repairs. Well-maintained vehicles with good fuel efficiency typically have longer lifespans and better resale value.

Regulatory Considerations

Many regions have implemented or are planning emissions-based taxation systems. In the UK, Vehicle Excise Duty (road tax) is directly tied to emissions for newer vehicles. Understanding your MPG helps estimate your vehicle's emissions and potential tax implications.

Future-Proofing Your Travel

With fuel prices subject to significant fluctuations and the trend toward stricter emissions standards, driving an efficient vehicle provides more stability in your transportation costs. Low-MPG vehicles may face increasing restrictions in urban areas as cities implement clean air zones.