I figure to chime in, long time owner of GM 6.0 engines. I like both engines, always have, always will. The Duramax of course being a turbo charged engine will produce much more power at an expense. The gas engine will pull the same load that you have cheaper to own overall, but slower in the hills at a higher rpm. Diesel verse gas is always an argument about what's cheaper to own. For me, gas has been cheaper all the way. I use calculations and can tell u that between the new diesel trucks and gas jobs, the gas jobs are cheaper to own. Now I'm sure some will dispute this but this is my experience only. My 6.0 pulls my 10k just fine, do I like to have more power at times in the steep grades, Sure who wouldn't. My truck does very well, just wind the rpm up some and it goes... so really it's all up to what you want as a consumer, simple as that. Either will work, just comes down to overall expense. The debate on cost will always go on, but some fleets are changing back to gas due to expensive issues when diesels break or emissions equipment failures. I like diesels, always have and will, the older pre emission trucks were awesome. Newer ones got me staying away for now. It's your wallet, I would see what fits the budget and go from there. I hope this helps just lending you my experience and yes I have pulled with both engines.
