The cheapest way to think about an electric car is the one most people skip: not the sticker, not the tax credit, but the cost of a single mile. Energy is where an EV either earns its keep or quietly doesn’t, and the number splits hard depending on one thing — where you plug in. Charge at home and an EV runs about a third of what gas costs per mile. Charge mostly on the highway at fast chargers and that advantage shrinks, sometimes to nothing. This page works the per-mile math both ways, using the same energy prices our EV vs gas calculator runs on, so the numbers here and there tell one story.

The home-charging number: about 5 cents a mile

Per-mile energy cost is a two-number calculation: what you pay for energy, divided by how far that energy takes you.

For an EV charged at home, that’s the residential electricity rate divided by the car’s efficiency. At the EIA national residential average of $0.176 per kWh, and a typical modern EV’s EPA-rated 3.5 miles per kWh (measured from the wall, so it already includes charging losses), the math is:

$0.176 ÷ 3.5 = about 5.0 cents per mile.

That figure lines up with what independent estimates land on — most put home charging around a nickel a mile — so it’s not an outlier; it’s the consensus, reached from published rates rather than a vendor’s calculator.

The gas number: about 15 cents a mile

Gas is the same shape of calculation: price per gallon divided by miles per gallon.

At an EIA average of $4.15 per gallon and a mid-size sedan’s 28 MPG:

$4.15 ÷ 28 = about 14.8 cents per mile.

So at these prices, home charging is roughly three times cheaper per mile than gas. Over 12,000 miles a year, that’s about $600 in electricity against roughly $1,780 in gasoline — a difference near $1,180 a year, purely on fuel.

One honest note on the gas figure: it moves with the pump price, and $4.15 is a national average that runs high in some states and low in others. Drop gas to $3.15 and the per-mile cost falls to about 11.3¢; the EV’s edge shrinks from 3× to roughly 2.2×, but it doesn’t flip. That’s why the calculator lets you set your own gas price — the shape of the answer is stable, the size of the gap is local.

The asterisk that decides it: home vs. public charging

The 5-cents-a-mile figure assumes you plug in at home. That assumption is doing most of the work, and it’s worth being blunt about why.

Public DC fast charging — the highway kind, the kind you use on road trips or if you can’t charge where you live — is priced very differently from home electricity. It’s commonly set at a level that mimics paying $3.50 to $5.00 a gallon for gas. In other words, fast charging can cost two to three times what home charging does per kWh, which pushes an EV’s per-mile cost up toward — and sometimes past — the gas figure.

So the real per-mile cost of an EV isn’t one number; it’s a blend, and your blend is the variable:

  • Charge almost entirely at home (the typical owner with a driveway and a Level 2 setup): you live near the 5¢/mile figure, and the 3× advantage is real.
  • Split home and public: your effective cost sits somewhere in between, and the advantage narrows in proportion to how much you fast-charge.
  • Rely mostly on public fast charging (apartment dwellers without home charging, heavy highway drivers): you can erase most of the fuel savings — the case where an EV’s energy cost stops being the selling point.

This is the single biggest reason EV-cost arguments go in circles: two people quote wildly different per-mile numbers and both are right, because one charges at home and the other doesn’t. There’s no honest single figure that covers both. The number that matters is yours, which depends on where you plug in — and that’s exactly the mix the EV vs gas calculator asks you to set.

Cheaper per mile is not the same as cheaper to own

Here’s the part a per-mile number can’t tell you, and it’s important enough to state plainly: fueling cost is one line in the total cost, not the total.

An EV can win decisively on cents-per-mile and still cost more to own over five years, because two other lines often run the other way:

  • Purchase price. EVs still carry a higher average transaction price than comparable gas cars, so you start further behind.
  • Depreciation. EVs have tended to lose value faster than gas cars — by five years, many EVs retain a notably smaller share of their price than the gas equivalent. That faster drop can outweigh years of fuel savings. (We cover this in car depreciation by year.)

At default assumptions, our own EV vs gas calculator actually shows the gas car cheaper over five years despite the EV’s lower per-mile energy cost — because the higher purchase price and steeper depreciation more than eat the fuel savings on that timeline, with the EV pulling even only further out. Charge cheaply and drive a lot of miles and the fuel advantage compounds in the EV’s favor; drive little, or sell early, and it may never catch up. That maintenance-and-resale tradeoff — and how hold length decides which way it tips — is the other half of the EV cost story, worked through in EV vs gas: maintenance, resale, and the long-haul math.

The federal purchase credit that used to tilt this math is also gone: the clean-vehicle (30D) credit expired September 30, 2025, so a new EV bought today carries no federal purchase credit unless Congress reinstates one. (A separate 30% credit for home charging equipment is also set to expire June 30, 2026 — worth knowing if you’re pricing a Level 2 installation, but it’s the charger, not the car.)

None of that cancels the per-mile advantage — it just means the per-mile advantage is a chapter, not the whole book.

Working your own number

If you want your real cost per mile rather than the national-average version, you need three inputs you already have access to:

  1. Your electricity rate — the “energy charge” line on your utility bill, in dollars per kWh.
  2. Your EV’s efficiency — its EPA miles-per-kWh on fueleconomy.gov, or the running average on the car’s own display.
  3. Your charging mix — roughly what share is home versus public fast charging.

Cost per mile = rate ÷ efficiency for the home share, blended with your fast-charging rate for the rest. For the gas side, it’s just your local gas price ÷ your car’s MPG.

That blend, set against the purchase price and depreciation that a per-mile figure ignores, is the whole comparison — and it’s what the EV vs gas calculator puts together over a five-year horizon. For everything that goes into a car’s cost beyond fuel, the full cost of owning a car lays out the rest.