GM's big pickups to go hybrid DETROIT General Motors will introduce a hybrid full-size pickup and a concept hybrid truck this week at the Chicago Auto Show betting that pickup drivers have been itching to jump on the hybrid bandwagon. GM says the 2009 GMC Sierra hybrid gets 25 percent more miles per gallon without compromising performance while its GMC Denali XT concept a low-slung muscular utility vehicle gets 50 percent better fuel economy than a comparable small …
