EV vs Gas Car: How to Actually Compare Total Cost of Ownership

Almost every EV-versus-gas spreadsheet I've seen compares two things: the monthly payment and the fuel bill. Then it declares a winner.

That's close to useless, because the two largest costs of owning any car are depreciation and insurance, and neither behaves the way people assume when you swap a gas tank for a battery. Fuel savings are the easiest line to calculate, which is why they get all the attention and why people are surprised three years in.

So let's build it properly. No made-up prices, no "the average driver saves $X" — a framework you fill with your own numbers, plus the places where intuition goes wrong.

Convert everything to cents per mile

Monthly payments hide too much. A five-year loan on a cheap car and a three-year lease on an expensive one can produce identical monthly numbers and radically different total costs. Cents per mile forces you to state how much you actually drive — and annual mileage is the single variable that decides this whole question.

Get every line below for both vehicles, over the same holding period, or you're not comparing anything.

Cost line	Typically favors	Why people get it wrong
Depreciation	Varies wildly by model	Largest line, almost never estimated
Energy (fuel or electricity)	EV, usually strongly	Assume home rates, then charge publicly
Insurance	Gas, often	Assumed to be identical; frequently isn't
Scheduled maintenance	EV	Real savings, but smaller than advertised
Tires	Gas	Ignored entirely; EVs are hard on tires
Repairs out of warranty	Gas, on average	EV repairs are rarer but pricier per event
Charging hardware / install	Gas (EV-only cost)	Treated as optional, often isn't
Registration, fees, road-use taxes	Varies by state	Several states now add EV surcharges
Financing interest	Whichever costs less up front	Interest on a higher price is a real EV cost
Incentives and credits	EV, where available	Eligibility rules change; don't assume
Time and hassle	Depends entirely on your parking	Not a dollar cost, but it decides satisfaction

Pick a holding period first — three years if you churn cars, seven or more if you drive them into the ground. The answer flips depending on which you choose, and that's not a flaw in the math. Short holders eat depreciation; long holders eat repairs. EVs and gas cars aren't equally good at those two things.

Energy: the one line you can calculate exactly

This is the fun part, because it's arithmetic with no guessing.

For an EV: take the vehicle's consumption in kWh per 100 miles (the EPA window sticker gives it, and real-world use runs higher in cold weather and at highway speed), multiply by your electricity rate per kWh, and add roughly 10 percent for charging losses — the energy that goes into heat rather than the battery.

For a gas car: divide 100 by your real observed MPG, then multiply by your local price per gallon. Use your observed MPG, not the sticker.

Here's that math run at a range of rates. Assumptions stated: 30 kWh/100 mi for the EV, 30 MPG for the gas car, no charging-loss adjustment included, and these are illustrative rate points rather than any particular market.

Electricity rate	EV cost / 100 mi	Gas price	Gas cost / 100 mi
$0.10 / kWh	$3.00	$3.00 / gal	$10.00
$0.15 / kWh	$4.50	$3.50 / gal	$11.67
$0.20 / kWh	$6.00	$4.00 / gal	$13.33
$0.30 / kWh	$9.00	$4.50 / gal	$15.00
$0.45 / kWh	$13.50	$5.00 / gal	$16.67

Two things jump out. At home rates the EV wins energy by a mile, usually a factor of two to three. At public DC fast-charging rates — the bottom of that column — the advantage collapses to almost nothing.

That's the trap. Charge at home 90 percent of the time and you're near the top row. Rely on public fast chargers and you're at the bottom, plus the time cost of sitting at them. Same car, completely different economics.

Blend your own rate honestly

Don't use your best-case rate. Estimate the split — say 80 percent home, 15 percent public Level 2, 5 percent fast charging — and compute a weighted average. If you're on a time-of-use plan with a cheap overnight window and you can reliably charge inside it, use that window's rate. If you can't, don't.

Also check whether adding an EV pushes your household into a higher electricity tier. In tiered-rate territory the marginal kWh you add for the car costs more than your average kWh, and using the average understates it.

Depreciation is the biggest line and nobody models it

Over a typical ownership period, the money you lose to the car simply being older than it was is usually larger than fuel, maintenance, and insurance combined. It's also invisible, because you pay it once, silently, on the day you sell.

EV depreciation is harder to predict than gas-car depreciation, and anyone who tells you confidently how it'll go is guessing. The forces pushing EV resale down are structural: battery technology improves fast, so a five-year-old EV competes against new cars with better range and charging speed; price cuts and incentives on new EVs drag used values with them; and buyers are nervous about battery health, justified or not.

Against that, EVs have very little that mechanically wears out, and a used EV with a healthy pack is a low-hassle car. Some models hold value well. The variance between models is enormous.

What to actually do about it, since you can't predict it:

• Look up used prices for the exact model, three to five years old, right now. That's your best evidence for how the purchase will behave. Do the same for the gas car.
• Consider buying used and letting someone else absorb the steepest part of the curve. This is the strongest argument in favour of EV ownership economics and it's badly underused. A three-year-old EV has taken the hit, has most of its powertrain life ahead of it, and often still carries battery warranty.
• Treat a lease as a way to buy certainty, not to save money. Leasing hands residual-value risk to someone else. You pay for that.
• Check battery warranty terms first. Length, mileage cap, and what degradation threshold triggers a replacement. That warranty is the floor under used value.

If you're the kind of buyer who trades cars every three years, depreciation dominates your cost and everything in this article about fuel and maintenance is noise. Go shop residual values and stop reading spreadsheets.

Maintenance: real savings, oversold

EVs skip oil changes, spark plugs, timing belts, fuel filters, exhaust systems, and transmission service. That's a real list and the savings are real. Regenerative braking also means brake pads on an EV can last dramatically longer than on a comparable gas car, because most ordinary slowing happens through the motor.

Now the part the enthusiast forums undersell.

Modern gas cars aren't maintenance disasters. On a well-built one driven normally, scheduled service for the first several years is mostly oil, filters, and fluids — not a crushing sum. The EV advantage is genuine but it's measured in a few hundred dollars a year, not thousands.

Meanwhile EVs have their own items. Cabin filters and wipers don't care what drives the wheels. Coolant systems still exist, because battery thermal management uses them. Brake fluid still needs changing, and calipers that rarely get used can seize — an ironic consequence of regen. Suspension parts wear faster under the extra weight. And 12-volt auxiliary batteries fail on EVs just like on gas cars.

Out-of-warranty repairs are the real asymmetry, and it cuts both ways. EVs have fewer failure modes, so repairs are less frequent. But when something significant goes wrong — a pack module, a drive unit, an inverter — the bill can be enormous, and independent shops able to do the work are thin on the ground. Fewer, bigger events versus more, smaller ones. If one large surprise bill would genuinely hurt you, that matters more than the average.

Insurance and tires, the two surprises

Insurance is the line that most often reverses people's conclusions, and everyone assumes it's a wash.

It frequently isn't. EVs tend to cost more to insure than similar gas cars, for unsentimental reasons: higher replacement value, expensive components clustered where crashes happen, structures that cost more to repair, fewer certified shops, and packs that insurers may write off after damage a conventional car would shrug off. Also, many EVs are quick, and quick cars get rated as quick cars.

This is trivially easy to check and almost nobody does it. Get real quotes on both specific vehicles, with your address and driving record, before you buy. Twenty minutes, and it can move the answer by hundreds a year.

Tires are the other quiet line. EVs are heavy and they make torque instantly from a stop, which wears tires faster. Many also come on specialized low-rolling-resistance tires, sometimes with foam noise liners, and those cost more to replace. Fitting cheap conventional tires instead costs you range.

Budget for tires more often on the EV. It won't overturn the energy savings, but it eats into them, and people leave it out entirely.

Charging access is a cost, not a feature

Where you park at night determines whether an EV is cheap and effortless or expensive and annoying. This isn't a small factor. It's the factor.

If you have a garage or driveway, a Level 2 install is a one-time cost that depends on your panel capacity, the run from panel to parking spot, and whether your electrical service needs upgrading. That last one is the wildcard — an older home with a small panel can turn a modest install into a serious project. Get an electrician to quote it before you buy the car.

Some people get by on a standard household outlet. It adds a few miles per hour of charging, which is fine for a 25-mile-a-day commute and hopeless past that.

If you park on the street or in a garage with no outlets, be honest with yourself. You'll be a public-charging customer, which means the bottom row of that energy table plus session fees plus time. Employers and buildings are adding chargers, which changes everything — but "they're planning to" is not a charging plan.

Incentives without guessing at numbers

I'm not going to quote figures, because purchase incentives change frequently and the eligibility rules are where people get burned. What's stable is the structure, so here's what to go verify.

• Federal purchase incentives — check current eligibility, which historically has depended on where the vehicle and its components were made, the vehicle's price, and the buyer's income. Verify against the official government source, not a dealer's brochure.
• State and local incentives — separate programs with separate rules, sometimes capped and first-come.
• Utility programs — the most overlooked category. Rebates on charger hardware or installation, plus EV time-of-use rate plans that can cut your per-mile energy cost substantially.
• Used-EV incentives — some jurisdictions have them, which stacks well with buying used.
• Costs in the other direction — several states charge EVs an annual fee to replace lost fuel-tax revenue.
• Whether it's a credit, a rebate, or a point-of-sale reduction — this changes your cash flow and, if it's a nonrefundable credit, whether you get full value at all.

Rule of thumb: only count an incentive you've confirmed you personally qualify for, from the agency that administers it. Everything else is a maybe, and maybes don't belong in a cost comparison.

Finding your actual break-even

Here's the compact version of the whole exercise.

1. Pick two specific vehicles you'd genuinely buy, and a holding period.
2. Estimate depreciation for each by looking up today's used prices at that age and mileage.
3. Compute energy cost per mile for each, using your blended rate.
4. Get real insurance quotes on both.
5. Add maintenance, tires, fees, and financing interest.
6. Add the charger install as a one-time EV cost.
7. Subtract only confirmed incentives.
8. Divide everything by your expected total miles.

Then look at what's driving the difference. If the EV wins, it's usually energy plus maintenance overcoming a higher price and higher insurance — and the more miles you drive, the more decisively that works, because energy savings scale with mileage while the price gap doesn't.

Hence the one-line heuristic: high annual mileage plus home charging is the strongest case for an EV; low mileage plus street parking is the weakest. Everything between depends on the specific cars.

Who should just buy the gas car

Not everyone should switch, and pretending otherwise is how people end up unhappy.

Buy the gas car if you drive very few miles — energy savings need mileage to overcome a price premium, and a 6,000-mile-a-year driver may never get there. Buy it if you have no realistic home or workplace charging and no near-term prospect of it. Buy it if you tow regularly, because towing hits EV range hard. Buy it if you routinely cover long distances in serious cold, where range and charging speed both suffer.

A hybrid is the answer people skip. If your problem is fuel cost and your constraint is charging access, a conventional hybrid gets most of the energy savings with none of the infrastructure question. Boring. Also frequently right.

Questions people ask

Will the battery need replacing, and will that wipe out my savings?

Battery packs degrade gradually rather than failing suddenly, and most lose capacity fastest early on before settling into a slow decline. Full replacements outside warranty are uncommon on modern EVs, though they're expensive when they happen. Read the warranty's degradation threshold — that number tells you what the manufacturer is actually willing to stand behind.

Does fast charging ruin the battery?

Heavy exclusive reliance on DC fast charging is harder on a pack than routine slow charging, and manufacturers generally recommend slow charging as the default. Occasional fast charging on road trips is what the capability is for. If fast charging would be your only option, that's an argument against the EV on both cost and longevity grounds.

How much does cold weather change the math?

Meaningfully. Cold reduces usable range and increases energy per mile, partly because cabin heat in an EV comes from the battery rather than free from engine waste heat. Heat pumps reduce the penalty but don't eliminate it. If you live somewhere with real winters, use a worse kWh/100 mi figure than the sticker for several months of the year.

Is the resale risk on EVs a reason to lease?

It's a legitimate reason to consider leasing, yes — you're paying someone else to carry a risk you can't estimate. Just don't tell yourself it's cheaper. It's insurance, and insurance has a price.

Run the numbers on your own two candidate cars, and run them twice: once assuming three years of ownership, once assuming eight. Same answer both times means you've got your decision. If it flips, the real question was never EV versus gas — it was how long you keep cars.