More and more people are buying cars. Although the rising oil prices make people sigh that it's not easy to afford a car, it has not stopped the enthusiasm and pace of those without cars to buy one. The focus of attention has merely shifted from considering personal needs more towards the issue of fuel efficiency. Low fuel consumption, large space, economical, affordable and good maintenance have gradually become the primary conditions for people to buy a car. However, there is an overwhelming amount of information about cars.