CarGurus is a trustworthy website for buying and selling used cars. It allows sellers to create car listings and buyers to search available listings. The website designates how good of a deal each listing is and uses a formula to remove listings that aren't genuine.
Search results are ranked by consumer savings and dealer rating. A buyer can rate any dealer he purchases a car through and leave a review. CarGurus uses a formula to determine a car's instant market value. Based on this value and the price of the car, the deal for that car is designated as great, good, fair, high or overpriced.