( http://www.TFLcar.com ) What's the most fuel efficient car that you can buy today? We at The fast Lane Car are lucky to drive a different car every week so we've had the chance to drive many (if not most) of the best new fuel efficient cars on the market. We've also been able to test some the cars at sea level and some a mile above sea level in real world driving. So without further delay here are the top 7 new cars that we've driven in 2012 that get 40 MPG or higher.