At Friday's news conference, President Obama tried to connect with the common man coping with rising gasoline prices. Instead, the president left little doubt that he is clueless about cars. "You may want to buy a fuel-efficient car," quoth Obama, "but you may not be able to afford it. And so you're stuck with the old clunker that's getting 8 or 10 miles a gallon." Eight to 10 mpg? Which clunker would that be? I wondered. An old Hummer? Your father's father's Oldsmobile? A late-model Lamborghini? It takes a luxury brand, a boat-sized machine and/or a few decades to approach...