Watch as the 2011 Super Duty Diesel, with best-in-class 400 horsepower and best-in-class 800 lb.-ft. torque, motors past the 2011 Silverado Diesel once again.<br /><br /><br /><img src="http://ll.broadbandsports.com/images/40625_thumb.jpg" alt="2011 Super Duty - Challenge 4 | Fuel Efficiency Rematch - Super Duty Vs Silverado" title="2011 Super Duty - Challenge 4 | Fuel Efficiency Rematch - Super Duty Vs Silverado" width="150" height="90" alt="2011 Super Duty - Challenge 4 | Fuel Efficiency Rematch - Super Duty Vs Silverado"/>
