Rachel is doing a report on different brands of cars. She really cares about the environment and wants one that is gas efficient. The three cars that she has chosen to research tell her different information about gas mileage. Car A has a sticker that tells her that it has a 22 gallon tank and can go an average of 629 miles per tank. Car B tells her that it can travel 1,000 miles in approximately 37 gallons of gas. Car C gets 30 miles per gallon. Which car has the best gas mileage?