As the 2009 Corvette ZR1 was unveiled on the very same day that President Bush signed into law a new energy bill, the obvious question is where do we go from here? The most prominent part of the bill was the first increase in corporate average fuel economy requirements in over two decades. By 2020, most manufacturers will have to achieve a sales weighted average fuel economy of 35 mpg for their fleets. Note that was "most" and not "all" manufacturers, a subject we'll return to in a moment.