In an effort to serve the most users given a limited number of hours for data entry, for guaranteed inclusion in the database a car, SUV, or minivan must be purchased by more than 1,500 people in the average month. The tally currently includes over 170 2006 models and over 130 2007 models. The main categories affected by the volume criterion are high-end luxury cars and sports cars. I also have not yet entered any pick-up trucks because they each involve about as much work as a dozen cars and I'm not sure how many people would be interested. However, if enough people email me requesting an omitted model, I'll enter it.