Peterbilt's New "Super Truck" Gets 10 MPG—Double the National Big Rig Average

More than two million semis travel some 120,000 miles apiece along America's arterial highways every year at an average efficiency of just 6 MPG. Six. Miles per gallon of diesel—not even Hummers are that wasteful. However, a new "Super Truck" design by Peterbilt has shown it can go the same distance for half the gas. »3/22/13 3:20pm3/22/13 3:20pm