EV Charging vs Gas: The Real Cost Comparison

“EVs are cheaper to run” is easy to say and rarely shown. So here’s the whole thing in the open. Fuel cost comes down to two short formulas — one for electricity, one for gasoline — and once you have both, the comparison is just two numbers side by side. Below we define the method, work a typical example, lay out a scenario table so you can see where the gap widens and where it narrows, and then hand you a calculator to drop in your own rate, mileage, and efficiency.

One thing up front, because it matters: this page compares fuel only— the electricity to charge versus the gasoline to fill up, for the same miles. It does not include maintenance, insurance, or the price of either car. Keeping the scope narrow is what makes the number trustworthy.

The method: two formulas

Cost per mile is the honest unit for this comparison, because it cancels out how far you drive. Both sides use the same idea — price of energy divided by how far that energy takes you:

• EV cost per mile= price per kWh ÷ miles per kWh. If you pay 15¢ per kWh and your car goes 3.5 miles on each kWh, that’s 0.15 ÷ 3.5 ≈ 4.3¢ per mile.
• Gas cost per mile= gas price per gallon ÷ MPG. At $3.30 a gallon in a 30 mpg car, that’s 3.30 ÷ 30 = 11¢ per mile.

You need four inputs, all of which you can look up: your electricity price (on your utility bill), your car’s efficiency in miles per kWh (from its spec sheet or the cost-to-charge math), the local gas price, and the MPG of the gas car you’re comparing against. The US DOE and EPA publish efficiency figures and a fuel-cost comparison you can sanity-check these against.

A worked example at typical numbers

Take mid-range, illustrative assumptions: a residential rate of 15¢ per kWh, an EV that averages 3.5 miles per kWh, and a comparable gas car at 30 mpg with gas at $3.30 a gallon. These are stand-ins to show the method, not a claim about your specific rate or car — swap in your own below.

At these assumptions the EV costs roughly 60% less per mile to fuel, and a 12,000-mile year comes out around $800 cheaper. That is a real, recurring difference — but notice it is entirely a function of four numbers. Change any of them and the gap moves, which is exactly what the next table shows.

Scenario table: where the gap widens and narrows

The same formulas, run across a range of realistic conditions. Cost per mile is what matters; read the EV rows against the gas rows.

Two honest takeaways sit in this table. First, home charging almost always wins: even at a high 30¢ rate, an EV in the garage (~8.6¢) beats a typical gas car (~11¢) and trades blows with an efficient hybrid-like sedan. The savings against a thirsty SUV or truck are largest of all. Second, the advantage is not automatic. Lean on public DC fast charging(~15¢ per mile at the prices above) and your cost per mile can climb to match — or exceed — an efficient gas car. Public fast charging is a convenience for road trips, not the way to realize the savings.

Where the comparison flips

Being straight about it: gas can come out ahead in specific cases. The EV’s edge shrinks or reverses when electricity is expensive(some regions run well above 30¢ per kWh), when gas is cheap(a dip toward $2.50 a gallon drops a 30 mpg car to ~8.3¢ per mile), when you drive a very efficient gas or hybrid car, or when you can’t charge at home and depend on public stations. If several of those line up at once, the fuel-cost difference can narrow to little or nothing. For most US drivers with a home outlet and average rates, though, the gap is real and consistent.

What this comparison leaves out

Fuel is one line on a much longer ledger. This page deliberately ignores everything else so the number stays clean, but a full total-cost-of-ownership picture would also weigh maintenance (EVs skip oil changes and have fewer wearing parts, though tires and insurance can run higher), the purchase price of each vehicle, depreciation, registration, and any tax credits or rebates. Those can push the total either way. If you want to lower the install side of the ledger, our tax-credit and rebate guide covers the federal, state, and utility programs worth checking. Treat this page as the fuel chapter, not the whole book.

Run your own numbers

Defaults here are illustrative — your answer depends on your rate, your miles, and the two cars you’re actually comparing. Enter them and the calculator shows a year of home charging next to a year of gas, and the difference between them.

Want to shrink the EV number further? If your utility offers a time-of-use rate, a smart chargercan schedule charging into the cheap overnight window automatically. And once you know your running cost, the last step is picking the hardware — start with the best Level 2 chargers or the deeper cost-to-charge breakdown.