On the heels of announcing it won't be participating in the North American International Auto Show in Detroit, Isuzu apparently will also be passing on the Chicago Auto Show as well. The company still insists, however, that this does not mean a U.S. pullout. In fact, this is Isuzu's second bye on the Chicago Auto Show in recent years, and company spokesman Chip Letzgus says that he's not ruling out a return to either Chicago or Detroit in the coming years. Isuzu's sales are off by 53 percent this year at 9,166 vehicles sold. By comparison, GM sold over 8,000 HHRs in the month of August alone.