Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins SuperTruck Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" achieved a full 9.9 mpg in testing Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck" Peterbilt and Cummins' "SuperTruck"