Which of the following is NOT a technique for estimating vehicle mileage?

Assessing the paint condition is not a reliable technique for estimating vehicle mileage. While the state of a vehicle's exterior can provide some insights into its overall condition and potential past repairs or wear, it does not directly correlate with the actual mileage driven.

In contrast, checking service records can offer documented mileage at various service intervals, allowing for a more precise estimation of how much the vehicle has been used. Contacting previous owners can provide personal insights about the vehicle's usage, including any significant changes in mileage. Using manufacturer warranty records is another pertinent method, as these records often include mileage at the time of service, thus helping to outline the vehicle's usage over time.