What a Mile in Your Car Actually Costs
August 18, 2026
AAA’s 2025 Your Driving Costs study put the average new vehicle at $11,577 a year, assuming 15,000 miles — a shade over 77 cents a mile. The IRS business standard mileage rate, which is meant to approximate the full cost of operating a vehicle, sat at 72.5 cents for the first half of 2026 before rising to 76 cents on July 1.
Both are averages of things that are not your car. Your own number is worth ten minutes of arithmetic, because it changes decisions that averages cannot.
What goes into cost per mile?
Seven categories cover almost everything:
| Category | Typical behavior |
|---|---|
| Fuel or charging | Varies directly with miles driven |
| Insurance | Fixed, barely moves with mileage |
| Maintenance, repairs, tires | Partly mileage-based, partly age-based |
| Loan or lease payment | Completely fixed |
| Registration, taxes, fees | Fixed, usually annual |
| Depreciation | Mostly time, partly mileage |
| Parking, tolls, washes | Varies by where you live |
Add them for a month or a year, divide by the miles you covered, and you have your number.
The split is the interesting part. In AAA’s figures depreciation alone came to $4,334 a year — the single largest slice, and one that never appears on a bank statement. Finance charges added $1,131. Fuel, the cost everybody feels because you watch a screen count it up, is rarely the biggest line.
Should I include depreciation?
It depends what question you are answering.
Include it if you want the true cost of ownership — the number that tells you what the car is really doing to your net worth. Leave it out if you want out-of-pocket running cost, which is the honest answer to “what does driving cost me this month”.
Either is defensible. What is not defensible is switching between them, because the whole value of tracking this is comparability over time.
To estimate depreciation without much work: look up what your car is worth today, look up what the same year and mileage were worth twelve months ago, and divide the difference by twelve.
Why is my cost per mile so high?
Almost always because of low mileage rather than high spending.
Insurance, registration, a loan payment and most depreciation carry on identically whether the car sits on the driveway all month or crosses three states. A car covering 4,000 miles a year spreads the same fixed costs across a quarter of the distance of one covering 16,000. The per-mile figure goes up by a factor of four while nothing about the car got worse.
This is the quiet case a lot of households eventually make for selling the second car. It rarely looks compelling in the abstract and often looks compelling once the number is on the page.
The same arithmetic runs the other way for an older, paid-off car. No payment, minimal depreciation left to lose, and modest insurance can put a well-kept ten-year-old sedan under 30 cents a mile — less than half the AAA average for a new one. AAA’s own study found a small sedan at 55.87 cents against that $11,577 headline.
What decisions does this number actually change?
Three, mostly.
Where you live. An apartment 15 miles further out that saves $200 a month is not saving $200 if it adds 8,000 miles a year. At 55 cents a mile it costs you $4,400 to save $2,400.
Whether the second car earns its keep. Run the figures separately for each vehicle. The one doing 3,000 miles a year usually has an eye-watering cost per mile, and that is the number worth putting next to what a few rides or a rental would cost instead.
Whether a trip is worth it. A 40-mile round trip to save $30 on something is roughly break-even. Knowing that turns a recurring argument into arithmetic.
How often should I recalculate?
Monthly is enough, and the trend matters more than any single month. Insurance renews, tires arrive all at once, and one bad repair can distort a month badly. Three or four logged months is where the line becomes readable — and where you can see whether a change you made actually did anything.
Frequently asked questions
Is the IRS mileage rate what my car costs?
Not exactly. The IRS rate is a nationwide approximation designed for tax administration, not a measurement of your vehicle. It makes a useful benchmark — 76 cents a mile for the second half of 2026 — but a paid-off compact driven 15,000 miles a year will usually come in well under it, and a financed truck driven 6,000 will come in well over.
Should I use cost per mile or cost per month?
Both, for different questions. Cost per month is what you budget. Cost per mile is what you compare — between cars, between commutes, between driving and not driving.
Does an electric car have a lower cost per mile?
Usually on energy and often on maintenance, but depreciation, insurance and any finance payment dominate the total for a newer vehicle of any kind. Run the same seven categories rather than assuming the answer from the fuel line alone.
Can I use this for tax purposes?
Treat it as budgeting, not tax preparation. Claiming vehicle costs against tax involves specific rules about the standard mileage rate versus actual expenses, and a tax professional is the right person to ask.
If you want your own figure instead of a national average, the Cost Per Mile Calculator splits the total across all seven categories, shows what each one costs per mile, compares the result against the IRS and AAA benchmarks, and logs it month by month. It is free, runs offline in your browser, and nothing you type is sent anywhere. For tracking the underlying spending as it happens — fuel, repairs, parts, insurance and renewals — there is also GarageNest.