EV vs gas: compare energy on your miles, not a headline

An EV is not “free fuel.” A gas car is not automatically cheaper because the payment is familiar. The only fair fight is the same miles, the same years, and your prices.

Hold the commute still and swap energy on the ownership calculator — gas MPG on one run, electricity on the next — then keep insurance and price on the same screen. This guide is the method behind that comparison.

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Hold miles and years still first

Headlines about national average fuel prices or average residential electricity rates are not your commute. Two neighbors can share a model and not share a bill: one charges overnight on a household rate, the other relies on highway DC fast charging; one drives 8,000 miles, the other 18,000. Start by writing the miles you will actually put on the car and the years you will keep it. Use those two numbers on both sides before you touch anything else.

If one vehicle is a second car that will sit, do not give it the commuter’s miles. That is a different comparison — and it usually favors the cheap-to-insure, cheap-to-park option, which may or may not be the EV.

How the energy line is built

For a gasoline or diesel car, energy is miles, miles-per-gallon, and the price you pay per gallon. For an EV, energy is miles, use in kWh per 100 miles (or an equivalent), and the price you pay per kilowatt-hour. Hybrids sit in the middle: they still buy gasoline, often much less of it. Switch the fuel type on the calculator to match the powertrain you are quoting.

U.S. window-sticker ratings live at fueleconomy.gov, including EV electricity use. The same site notes that all-electric vehicles convert over 77% of the electrical energy from the grid to power at the wheels, while conventional gasoline vehicles convert about 12% to 30% of the energy in gasoline. That is a physics and powertrain fact from the Department of Energy’s fuel-economy program, not a promise that your household bill will drop by a given percent. Charging losses, cabin heat, high speed, and cold weather all move real-world kWh use.

Home charging and public charging are different prices. If most of your miles will be home kilowatt-hours, use that rate. If a road-trip car will live on DC fast charging, use a higher blended rate or you will flatter the EV. You do not need a perfect blend on day one. You need a rate you could defend to someone who sees your charging app.

Insurance and price can erase a cheap energy line

Repair cost, parts, and claimed value can be higher on some EVs even when energy is cheaper. Insurers quote that as a premium, not as a footnote on a fuel article. Model it with the insurance input. A $50 monthly insurance gap over five years is $3,000 of cash — enough to cancel a lot of “saved gas.” Get quotes on both vehicles. The insurance guide covers how to use that line.

Purchase price and APR decide the payment. If the EV costs more to buy, the loan line may rise by more than the energy line falls, especially at low annual miles. High annual miles give electricity more chances to earn the difference back. That is why the same two cars can rank opposite ways at 8,000 and 18,000 miles. Do not borrow someone else’s mileage conclusion.

Maintenance is often lower on an EV because there is no engine oil, spark plugs, or exhaust to service. Tires and brakes still exist; tires can wear faster on a heavy, high-torque car. Put a maintenance allowance you believe on each side instead of zeroing the EV.

Credits, home equipment, and other one-time cash

If you actually receive a tax credit or rebate, lower the EV price or raise the down payment by that amount. If you do not qualify, do not enter one. This site does not look up programs and does not assume you get a credit.

A home charger is not an operating cost in the same way as kWh. If you will buy one, you can fold it into extras for the first year or into the down payment so cash out includes it. Public charging needs no home unit; it needs a realistic kWh price.

A fair run on the calculator

1. Open the ownership calculator and set the same miles and keep years for both cars.
2. Enter MPG and $/gallon for the gas car. Switch fuel type and enter kWh use and $/kWh for the EV.
3. Keep insurance and price on the same screen so the energy line is not compared alone.
4. Read monthly all-in and cash out. Then test a conservative and an optimistic resale percent on each car.
5. If the winner flips when you change only electricity price or only insurance, you have found the sensitive line. Get a better quote on that line before you decide.

Open the ownership calculator

What this comparison is not

It is not a climate model, a range planner, or a charging-network map. It does not tell you whether an EV fits your apartment parking or your winter. It answers a narrower question: on the miles you typed, does the energy line plus insurance plus price come out cheaper than the gas car you would actually buy instead?

Related: all-in method · same payment, different cost.

Car cost pages

• All car cost pages
• Tesla Model 3 total cost of ownership
• Honda Civic monthly payment and true cost
• Toyota Camry total cost of ownership

FAQ

Is electricity always cheaper than gasoline per mile? Often, if you charge at a residential rate. Public DC fast charging can close or reverse that gap. Enter the rate you actually pay.

Do I need a different keep period for an EV? Only if you will actually keep it for a different number of years. For a fair energy comparison, hold years and miles constant first.

Where should I put a tax credit? If you receive one, lower the EV price or raise the down payment by that amount. This site does not assume a credit.

Why might an EV still cost more all-in? A higher purchase price, higher insurance, and a resale percent you are not willing to bet on can outweigh a smaller energy line.

What official source should I use for efficiency? The U.S. fuel-economy labels and data at fueleconomy.gov. Then adjust if your commute is unlike the test cycle.