Fuel Cost · UK 2025
70 MPG Fuel Cost Calculator — Annual UK Driving Cost
At 70 miles per gallon, UK petrol at 145p per litre works out at roughly 9.4p per mile, and diesel at 148p per litre is about 9.6p per mile. Over 10,000 miles, that is £941.67 a year on petrol.
70 mpg is class-leading for combustion vehicles — achieved by the most efficient full hybrids and very economical small diesels. At this level, switching to a battery electric vehicle is the next big efficiency step in pence-per-mile terms, particularly if you can charge at home overnight.
Annual fuel cost at 70 mpg
| Annual miles | Petrol (145p/L) | Diesel (148p/L) |
|---|---|---|
| 5,000 miles | £470.84 | £480.58 |
| 7,500 miles | £706.25 | £720.87 |
| 10,000 miles | £941.67 | £961.15 |
| 12,500 miles | £1,177.09 | £1,201.44 |
| 15,000 miles | £1,412.51 | £1,441.73 |
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 70 mpg you burn 0.065 litres per mile. Multiply by your local pump price to get the exact cost per mile for your area.