EV & charging
Hybrid vs petrol running cost
A hybrid can save fuel, but the size of the saving depends on the kind of driving you do. City-heavy routes usually favour a hybrid more than steady high-speed motorway runs.
Quick answer
Calculate annual fuel cost for both cars with the same distance and your own fuel price: annual cost = distance ÷ MPG × price. Then compare the difference with the purchase-price gap.
Key takeaways
- Hybrids often help most in stop-start driving.
- Highway gains can be smaller than city gains.
- Use the same distance and price for both cars.
Why driving style matters
A conventional hybrid recovers some braking energy and can run on electric power at low speed. That is most useful in city traffic. At a steady highway cruise, the engine is already efficient and the electric assistance has fewer opportunities.
A plug-in hybrid is different: its result depends on how often you charge and how far you drive between charges.
The cost comparison
Use the same annual distance for both cars. Divide by each car's real MPG, multiply by the fuel price, and compare. Do not compare a city hybrid figure with a highway petrol figure.
annual fuel = annual distance ÷ MPG annual cost = annual fuel × price per unit saving = petrol cost − hybrid cost
Look beyond fuel
Purchase price, insurance, maintenance, tyre wear and resale value can change the result. A fuel saving is not the same as a total-cost saving. Use the fuel comparison as one input, not the whole decision.
Questions
Is a hybrid always cheaper to run?
How do I compare a hybrid with a petrol car?
Do plug-in hybrids get the same benefit?
Sources
- US EPA — fuel economy and EV range testing — Explains MPGe and the test basis for EV efficiency.
- fueleconomy.gov — understanding the EV label — How MPGe, kWh/100 miles and range appear on US labels.
- US DOE Alternative Fuels Data Center — home charging — Home charging equipment, tariffs and practical considerations.
- US EPA — electric vehicle myths — Common EV efficiency, emissions and charging questions.
- US EIA — electricity data — US electricity prices, generation and sales data.
- fueleconomy.gov — hybrids — How hybrid vehicles use fuel and electricity.
Try the calculator
Related guides
EV vs petrol break-even: how to calculate it
Estimate the annual running-cost saving from an EV and the years needed to recover a purchase-price difference.
City vs highway MPG explained
Compare city and highway fuel use for petrol cars, hybrids and EVs, and choose the right figure for your route.
How to calculate commute fuel cost
A practical method for turning your daily commute into a fuel budget, including round trips, working weeks and real-world consumption.
A note on prices and rules
Page last reviewed: . Formulas are covered by automated tests. Prices are inputs, not live data.