Arizona is one of the most complicated states I've ever visited. In the fall of 2007 I was living with my wife in Tucson. For Thanksgiving we left Tucson and eighty degree weather for some time at the Grand Canyon. That night we slept in a tent on the rim of the Canyon for as long as we could stand it, braving sub-freezing temperatures in sweatpants and long sleeve shirts. Well before sunrise we finally retreated to the car, where in a very environmentally unsound fashion we idled the engine ...