AP: Wal-Mart has made their fleet of semis 15% more fuel efficient as part of their enormous new environmental commitment. The company runs the nation’s largest trucking fleet, with 7,200 tractor-trailers. They intend to make them 25% more efficient by next year and 100% more efficient by 2015. Yet the pathetic American auto industry insists that it’s not even possible to increase efficiency by 10% in a decade. Feh.