Fuel Cost Calculator
Compare the cost of driving with petrol, diesel, or an electric vehicle. See cost per mile, trip cost, annual running costs, and CO2 emissions side by side.
Cheapest: EV (home)
£6.92
Journey
Vehicle efficiency
Fuel prices
Fuel prices: RAC Fuel Watch (Feb 2026). Electricity: Ofgem Q1 2026 price cap (home), Zapmap index (public rapid). CO2: DEFRA 2024 conversion factors.
Cheapest: EV (home)
£6.92
for 100 miles
Trip cost comparison
Petrol per mile
15.0p
Diesel per mile
14.2p
EV (home) per mile
6.9p
EV (public) per mile
19.0p
Fuel / energy needed
Petrol: 11.4L · Diesel: 10.1L · EV: 25.0 kWh
CO2 emissions (tailpipe)
Petrol: 26.3 kg · Diesel: 27.1 kg · EV: 0 kg
Switching to an EV saves 26.3 kg CO2 per trip vs petrol.
Verdict: EV (home charging) is cheapest at £6.92 for this journey.