AtWhatMileage is an online reference for used-car buyers and owners, showing what vehicle problems are reported, at what mileage they occur, how often they are reported, and how severe their consequences may be. Its analysis draws on more than 1. 3 million owner complaints filed with the US National Highway Traffic Safety Administration, including odometer readings for nearly 901,500 reports.

The site organizes information by make, model, and model year, covering thousands of model-year combinations and named failure types. Visitors can explore common issues, compare vehicles from the same model year, review reported mileage distributions, and see risk scores alongside report counts. Manufacturer and model-year pages help users investigate specific vehicles, while the methodology explains how the figures are calculated and their limitations.

AtWhatMileage emphasizes that complaints are not failure rates: reports can highlight when problems are reported, but cannot establish whether an individual car is reliable or well maintained. The site presents its data as a tool for deciding what to inspect and discuss when evaluating a used car, and makes the underlying figures available as JSON under a Creative Commons Attribution 4. 0 license