General Motors’ “green” strategy has always been to develop fuel-saving technologies that save the most gasoline. Its two-mode, strong hybrid system was developed for buses and trucks. When judged by the number of gallons of fuel saved, fleets of municipal buses equipped with this system have a more positive effect then all of the mild hybrids in compact passenger cars. GM has now brought this technology to full size SUVs. With consumers fleeing pickups and SUVs, is it too late?