The real running cost is not a single average for “a hybrid” or “an electric car.” Calculate the energy bill from your distance, the vehicle’s consumption and the prices you actually pay, then add ownership costs if you are comparing purchases.
Use these core equations:
- Fuel cost = distance × fuel consumed per distance × local fuel price.
- Electricity cost = distance × electricity consumed per distance × effective electricity price.
- Annual energy cost = annual fuel cost + annual charging cost.
- Total ownership comparison = energy cost plus depreciation or purchase payments, financing, insurance, maintenance, tires, taxes, registration and charging equipment over the same period.
A battery-electric vehicle (BEV) normally has only an electricity calculation. A conventional hybrid has a gasoline calculation. A plug-in hybrid (PHEV) needs both: electricity for the miles driven from the battery and gasoline for the rest. The result can change substantially with annual mileage, charging access, fuel prices, electricity tariffs and the time you keep the car.
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Decide what “running cost” means
People use running cost to mean two different things. Define the measure before entering any numbers.
Energy running cost
This is the recurring cost of moving the car: gasoline or diesel and electricity. It is the quickest way to compare powertrains and is useful when you already own the vehicles or want to isolate energy prices.
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Total cost of ownership
A purchase decision needs a wider calculation. Include the purchase price or depreciation, loan interest and fees, insurance, scheduled and unscheduled maintenance, tires, taxes, registration, charging hardware and installation, and energy. The U.S. Department of Energy Alternative Fuels Data Center (AFDC) annual-cost methodology includes fuel, electricity, tires, maintenance, insurance, license and registration, and purchase or loan payments. The International Energy Agency (IEA) total-cost-of-ownership tool also models purchase and operating costs, financing, insurance, residual value and efficiency assumptions.
Use one ownership period and one annual distance for every vehicle. Comparing a three-year cost for one car with a five-year cost for another can make the cheaper powertrain appear more expensive or less expensive for reasons unrelated to its energy use.
Collect the inputs that make the estimate personal
1. Annual distance and trip pattern
Start with the miles or kilometres you genuinely expect to drive. An odometer record, trip history, spreadsheet or phone log can establish a baseline; a paid paper mileage book is optional, not necessary. Separate city and highway use when the vehicle’s published figures differ, and note unusually short trips, long motorway journeys, towing or heavy loads.
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Do not substitute the 15,000-mile annual distance used on U.S. Environmental Protection Agency (EPA) labels for your own mileage. It is a standard label assumption, not a prediction of how far you will drive.
2. The exact vehicle’s consumption
Use the model year and version you are considering. For a gasoline or diesel vehicle, consumption may be shown as miles per gallon (MPG), litres per 100 kilometres or gallons per 100 miles. For an EV, it may be miles per kilowatt-hour (kWh), kWh per 100 miles or kWh per 100 kilometres.
Consumption per distance maps directly to a bill. If a car uses 30 mpg, fuel required is distance divided by 30. If it uses 28 kWh per 100 miles, multiply 28 by the number of 100-mile units driven. Convert units before multiplying; do not combine imperial MPG with U.S. gallons or kilometres without conversion.
For a PHEV, record both electric consumption and gasoline consumption. Electric-only efficiency is not the whole answer because the engine operates after the battery’s usable charge is depleted and on trips that exceed the electric range.
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3. The prices you actually pay
Use a current local fuel price and the electricity rate on your bill. If your electricity tariff changes by time of day, calculate the weighted rate for the hours when you normally charge. Public, workplace and home charging can have different prices; enter them separately rather than applying a home tariff to every kWh.
For a public charger, include the network’s energy price and any session, parking or subscription fee that applies to your use. For home charging, a utility-bill total divided by the kWh added can capture the price more accurately than a dashboard estimate.
4. Charging losses and operating conditions
A vehicle display may show energy used to drive, while your meter records energy drawn from the wall. The latter includes charging losses and is the relevant figure for the household bill. If you have wall-meter or utility data, use it; otherwise state whether your consumption figure is measured at the vehicle or the outlet and avoid claiming more precision than the input supports.
EPA warns that actual efficiency can differ because of driving style and maintenance, climate control and other accessories, weather, road conditions, vehicle load and other factors. Treat a label as a standardized starting point, not a guarantee.
5. Ownership horizon and non-energy costs
Choose the period you will own or finance the car, then estimate depreciation or purchase payments, interest, insurance, maintenance, tires, taxes and registration. Add a home charger, electrical work or dedicated parking costs when they are required. Insurance is personal: use your own quote or a defensible estimate rather than a generic average.
Calculate energy cost for each powertrain
Conventional non-plug-in hybrid
A hybrid electric vehicle (HEV) combines a gasoline engine and an electric motor. Its battery is normally replenished by the engine and regenerative braking rather than by a plug. NHTSA describes HEVs as gasoline-and-electric vehicles with this operating arrangement.
Use an appropriate combined or real-world gasoline-consumption figure:
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Annual HEV fuel cost = annual distance ÷ MPG × fuel price per gallon.
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Annual fuel cost = annual kilometres × (litres ÷ 100) × price per litre.
Use a real-world figure when you have one from the same model and route conditions. A city-heavy driver may not achieve the same result as a motorway driver, even in the same HEV.
Battery-electric vehicle
A BEV uses electricity from the grid. First calculate the effective price per kWh:
Effective electricity price = (home kWh × home rate + workplace kWh × workplace rate + public kWh × public rate + applicable fees) ÷ total kWh.
Then calculate:
Annual charging cost = annual distance ÷ miles per kWh × effective electricity price.
If consumption is expressed as kWh per 100 miles, multiply that figure by annual miles ÷ 100, then multiply by the effective price. Keep home, workplace and public charging shares visible so you can test a different routine.
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Plug-in hybrid
A PHEV has a plug-in battery but continues with engine assistance after its charge is depleted; designs differ. Estimate the share of your annual distance that is actually electric. Do not use the car’s maximum advertised electric range as your annual electric share unless your trips and charging routine support it.
Annual PHEV cost = (electric miles ÷ electric miles per kWh × electricity price) + (gasoline miles ÷ gasoline MPG × fuel price).
Electric miles are annual distance multiplied by the proportion of miles driven from charged energy. Gasoline miles are the remainder. AFDC’s methodology similarly uses charging frequency and trip distance to apportion PHEV travel between electricity and gasoline.
A worked energy-cost comparison
The following is an illustrative calculation, not a market forecast. It uses the same assumptions for all three vehicles so that the arithmetic is transparent: 12,000 miles per year, gasoline at $3.80 per U.S. gallon, home electricity at $0.16 per kWh, public electricity at $0.45 per kWh, and 80% of charging at home with 20% in public. The blended electricity price is $0.218 per kWh.
| Vehicle example | Calculation | Annual energy cost |
|---|---|---|
| HEV, 50 mpg | 12,000 ÷ 50 = 240 gallons; 240 × $3.80 | $912 |
| BEV, 3.5 miles/kWh | 12,000 ÷ 3.5 = 3,428.6 kWh; 3,428.6 × $0.218 | About $747 |
| PHEV, 60% electric; 3.2 miles/kWh electric and 40 mpg gasoline | 7,200 ÷ 3.2 = 2,250 kWh; 2,250 × $0.218 = $491. The remaining 4,800 miles ÷ 40 = 120 gallons; 120 × $3.80 = $456. | About $947 |
The example shows why a PHEV is not automatically the cheapest to fuel: its result depends on how often it is charged and how many miles remain gasoline-powered. Change the electricity mix, fuel price, annual mileage or consumption and the ranking changes. The figures exclude depreciation, finance, insurance, maintenance, tires, taxes, registration and charging equipment.
Turn energy cost into a full ownership comparison
Once annual energy costs are calculated, add the costs that differ between the vehicles. Keep one ownership period, one annual distance and one currency.
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| Cost component | How to estimate it | Common trap |
|---|---|---|
| Purchase price or depreciation | Use the transaction price, expected resale value and ownership period, or model depreciation directly. | Comparing list prices for one car with discounted transaction prices for another. |
| Financing | Include interest, arrangement fees and the timing of payments; use the same deposit and term assumptions when comparing loans. | Ignoring interest on a higher-priced vehicle. |
| Insurance | Use quotes for the same driver, address, coverage and excess. | Applying a national average to a personal decision. |
| Maintenance | Use the manufacturer schedule and realistic allowance for wear items. | Assuming a BEV has no maintenance or assuming every HEV has identical service costs. |
| Tires | Allow for tire size, replacement interval and seasonal sets where applicable. | Leaving tires out because they are not an energy cost. |
| Taxes and registration | Apply the rules for your jurisdiction and the vehicle’s emissions or weight class. | Using a rate from another country or tax year. |
| Charging equipment | Include the charger, installation, electrical upgrades and any recurring network fee. | Assuming every driver can charge at home without installation cost. |
A useful decision metric is the break-even period for a higher-priced car: divide its additional upfront or financed cost by the annual saving in energy and other running costs. Treat that as a screening calculation, not a verdict, because resale value, insurance and financing can change the result.
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U.S. DOE Alternative Fuels Data Center Vehicle Cost Calculator
The AFDC calculator compares total cost of ownership and emissions for up to eight selected vehicles or custom entries. It asks for fuel efficiency, electricity use, state and charging frequency, and its methodology includes costs beyond energy. Enter your own annual distance, prices, charging pattern and ownership period, then inspect the individual categories rather than relying only on the total.
Argonne National Laboratory Fuel Cost Comparison Calculator
Argonne’s calculator focuses on fuel cost comparisons among internal-combustion vehicles, HEVs, PHEVs and BEVs. It exposes geographic fuel prices, residential and public charging prices and the share of public charging. The tool was last updated 5 August 2026. It is useful for an energy-cost sensitivity check, but it is not a complete personalized ownership-cost assessment.
International Energy Agency total-cost-of-ownership tool
The IEA tool covers purchase and operating costs, financing, insurance, residual value and vehicle-efficiency assumptions. Its page lists 13 December 2022 as the last update, so review its default prices and cost assumptions before using the result for a current purchase.
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Understand the current published figures in context
UK advisory charging rates from 1 September 2026
HM Revenue & Customs lists advisory electric rates of 7 pence per mile for home charging and 15 pence per mile for public charging for fully electric company cars, effective 1 September 2026. The home rate uses weighted new-car efficiency and domestic electricity costs; the public rate uses public-charging price data. These are reimbursement guidelines, not a guaranteed household tariff or a universal EV running-cost figure.
The underlying weighted electrical-efficiency input reported in the same guidance is 3.59 miles per kWh. That is an input to the advisory-rate calculation, not the efficiency of every vehicle. The guidance treats hybrids as petrol or diesel for advisory fuel rates.
U.S. EPA label assumptions
EPA label annual fuel-cost estimates assume 15,000 miles per year and use a projected gasoline price that is updated annually. EPA’s label guidance says: “This part of the fine print also details the assumptions that are used to determine the estimated annual fuel cost and the value used to compare 5-year costs to the average vehicle.”
The same guidance cautions: “This part of the fine print has a reminder that your fuel economy and emissions may be different due to a number of factors, such as how you drive and maintain your vehicle, how much you use air conditioning and other accessories, the weather, road conditions, how much the vehicle is loaded, and other factors.” Use the label to compare vehicles under a common test, then replace its mileage and price assumptions with yours.
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A single result can hide a fragile assumption. Recalculate with realistic high and low cases.
- Distance: test your expected annual mileage and a higher or lower case if your commute may change.
- Fuel price: use a range rather than treating today’s pump price as permanent.
- Electricity: separate home, workplace and public charging, and test a tariff change.
- PHEV electric share: model the percentage you achieve when charging daily, weekly or only occasionally.
- Efficiency: test winter, motorway, climate-control and loaded-trip conditions where they are relevant.
- Ownership: vary the resale value, insurance quote, financing rate and charging-installation cost.
Show the contribution of each component. If a small change in public-charging share reverses the result, the correct conclusion is that access and routine matter more than a generic “hybrid versus EV” label.
A repeatable worksheet
- Set the comparison: list the exact vehicle versions, currency, country, annual distance and ownership period.
- Enter consumption: record gasoline or diesel consumption, electric consumption and, for a PHEV, both modes.
- Enter prices: add local fuel, home, workplace and public charging prices, including applicable fees.
- Allocate distance: for a PHEV, enter electric and gasoline shares based on actual charging and trip patterns.
- Calculate energy: apply the formulas for each vehicle and keep the intermediate gallons, litres and kWh visible.
- Add ownership costs: enter purchase or depreciation, financing, insurance, maintenance, tires, taxes, registration and charging equipment.
- Stress-test: change mileage, prices, efficiency and PHEV charging share to see which assumptions drive the result.
- Compare like with like: review annual cost, total period cost and each component under identical assumptions.
There is no reliable universal annual figure for “a hybrid” or “an EV.” A defensible estimate is the one that exposes its distance, efficiency, prices, charging mix and ownership assumptions so you can replace them with your own.
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