EV vs Petrol Running Cost
Cost per 100 km on electricity against petrol, and the fuel price where the two meet. Fuel and charging only — purchase price, servicing, tyres and insurance are out of scope.
Electric car
kWh/100km
At the battery, as a trip computer reads it. Charging losses are added below.
The meter always reads more than the battery gains.
The rest is public fast charging, at the higher rate.
Charging tariff
cents per kWh
c
c
Petrol car
L/100km
c/L
Driving
km
Driving electric saves
— per year
- Electric
- — per 100 km
- Petrol
- — per 100 km
- Electric
- — per year
- Petrol
- — per year
- Saving
- — per year
- Saving
- — over five years
- Break-even pump price
- — c/L
- Break-even electricity
- — c/kWh
Below this, petrol is cheaper
Blended, at the meter
Annual saving against distance
saving vs km per year
The relationship is a straight line through the origin: the saving is a fixed amount per kilometre, so the only question is how many you drive. Below the break-even line the electric car is the dearer one.
Where the energy goes
- Metered energy
- —
- Blended electricity price
- —
- Charged per year
- —
- Petrol burned per year
- —