The bi-fuel system automatically switches to gasoline when the CNG tank is empty, or drivers can manually switch between fuel sources while driving. The 6.0L V-8 engine features hardened valves and intake/exhaust valve seats.
Cars.com Picks 2015 GMC Sierra 3500 HD As Top 1-Ton Pickup
Cars.com has selected the 2015 GMC Sierra 3500 HD as the top 1-ton heavy duty pickup in a challenge powered by PickupTrucks.com and Mrtruck.com.