If you're like me, the bluster and grandstanding associated with big congressional actions make you want to roll up the windows, crank up the radio, and tune out the whole circus. But the mammoth energy bill finally passed by Congress and signed by President Bush is something consumers should pay attention to. Among other things, the new law will directly affect the kinds of cars on the market in a few years--and what buyers pay for them. Some of the big changes that automakers and consumers will both have to contend with: Surprisingly tough gas mileage standards. The requirement to...