Update on 2011 Ram 1500 CNG conversion for anyone interested. Well the Hemi finally went bad after 201K miles which at least 90% of those miles were running on CNG. So the system paid for itself and then some. But, CNG was not the cause for the engine to go bad. I had an oil change like always and some goofball left oil way low and ruined the engine. So there is no telling how many miles I could have ran the cng system for. But since the truck was still in excellent condition after the orig. engine went bad I went ahead and replaced the engine. I don't drive this Ram on a daily basis any longer but it runs and drives great. BTW is didn't hook the cng system back up since I don't drive it that much any longer.