Purchase a new car begins with an identification of the factors

Your quest to purchase a new car begins with an identification of the factors important to you. As you conduct a search of cars that rate high on those factors, you collect evidence and try to understand the extent of that evidence. A report that suggests a certain make and model of automobile has high mileage is encouraging. But who produced that report? How valid is it? How was the data collected, and what was the sample size?