We believe that the solution to our transportation future lies not in increasing miles per gallon alone, but in overhauling the ways we get from here to there (see our Transportation issue). That said, Business Week's photo-filled list of the year's 20 coolest concept cars is pretty awesome. It offers a look at some truly impressive automobiles, from the efficient-like the 110 mile-per-gallon Jeep Renegade (image after the jump)-to the absurd, such as the Cadillac WTF (pictured) which can allegedly go 100 years without maintenance.Toyota's iQ.The aforementioned Jeep.