Fuel Cost · UK 2025
50 MPG Fuel Cost Calculator — Annual UK Driving Cost
At 50 miles per gallon, UK petrol at 145p per litre works out at roughly 13.2p per mile, and diesel at 148p per litre is about 13.5p per mile. Over 10,000 miles, that is £1,318.34 a year on petrol.
50 mpg is achievable in modern small petrol cars, mild hybrids and most modern diesel saloons and estates. Over 10,000 miles a year, the fuel-cost difference between this range and a 25 mpg vehicle is substantial.
Annual fuel cost at 50 mpg
| Annual miles | Petrol (145p/L) | Diesel (148p/L) |
|---|---|---|
| 5,000 miles | £659.17 | £672.81 |
| 7,500 miles | £988.76 | £1,009.21 |
| 10,000 miles | £1,318.34 | £1,345.62 |
| 12,500 miles | £1,647.93 | £1,682.02 |
| 15,000 miles | £1,977.51 | £2,018.42 |
Based on UK imperial gallons (4.546 litres/gallon). Pump prices fluctuate weekly — check the latest with the RAC Fuel Watch or BEIS weekly price data.
How the calculation works
UK MPG is based on the imperial gallon, which equals 4.546 litres. Cost per mile is calculated as:
At 50 mpg you burn 0.091 litres per mile. Multiply by your local pump price to get the exact cost per mile for your area.