How the mileage check works
Odometer fraud has not gone away with digital dashboards. NHTSA estimates that more than 450,000 vehicles are sold each year in the U.S. with false odometer readings (NHTSA: odometer fraud). The display itself proves little. What helps is a series of independent readings taken at different times, which should only ever go up.
Our report collects the readings that were recorded each time the VIN appeared in our sources:
- Online listings. Dealer and private listings of the car over time, from U.S. and Canadian listing data, each with the date, asking price, odometer reading and seller. The report shows how many times the car was listed and the odometer range seen.
- Salvage auction sales. The odometer recorded when the car sold at an auction such as Copart or IAAI.
- Sales records. The odometer noted with recorded sales, along with the sale date, price and seller type.
The mileage inconsistency flag
The report walks through the listing readings in date order. If a later listing shows a reading more than 500 miles lower than an earlier one, it shows a red "Mileage inconsistency detected" alert. Placeholder readings below 500 miles, which some listings use when the mileage is unknown, are ignored so they do not trigger false alarms.
The flag is a reason to look closer, not a verdict. A typo in a dealer listing, a replaced instrument cluster or a kilometer reading entered as miles can all produce a drop. A real rollback usually shows up as a clear break in an otherwise steady line, for example 92,000 miles in one listing and 61,000 miles a year later.
How to read the readings
- Steady climb. Readings that rise at a plausible rate (often 10,000 to 15,000 miles a year for a daily driver) support the current odometer.
- A drop. Ask the seller for service invoices, inspection records and the title, which all carry odometer readings. Compare them with the listing dates.
- A long gap. No readings for several years is normal for cars that stayed with one owner. It also means the data cannot vouch for those years.
- Odometer lower than at a salvage auction. Treat this as serious: the car was damaged, and the mileage may have been changed during repairs.
- Few or no readings. A car that was never listed online or sold through a recorded sale will have little data. That says nothing either way.
Other ways to verify mileage
There is no free official odometer lookup by VIN in the U.S. or Canada. These sources are worth combining with our report:
- The title and odometer disclosure. Federal law requires a written odometer disclosure when ownership is transferred. Model year 2010 and older vehicles are now exempt, and model year 2011 and newer vehicles are exempt 20 years after their model year (49 CFR 580.17).
- An NMVTIS report includes the latest odometer reading reported to the title system (approved providers).
- Service and inspection records. Oil-change stickers, dealer invoices and state inspection reports all record mileage.
- Wear. Pedals, seat bolsters and the steering wheel on a 40,000-mile car should not look like those on a 140,000-mile car. Our odometer rollback guide lists seven practical checks.
Free preview vs. full report
| Free preview | Full report ($9.99) | |
|---|---|---|
| Listing history | Number of online listings found | Each listing with date, odometer, price, seller; mileage inconsistency flag |
| Auction records | Number of records | Odometer at sale, damage, title type, photos |
| Sales history | Number of records | Sale date, odometer, price, seller type |
| Vehicle | Year, make and model | Full VIN decode and specifications |
The preview is free and needs no account: enter the VIN and you see the year, make and model and how many auction and damage, listing and sales records we found. The salvage title, theft and recall results are only in the full report. The full report costs $9.99 (USD) for a single VIN, with lower per-report prices in packs and monthly plans. Report credits never expire, and a purchased report stays in your account with a PDF download.