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Just an unfair comparison. If you're strictly talking about pulling something, and all things are "fair", a gas engine is pretty much going to loose to a diesel engine every time in terms of both getting moving, fuel efficiency once it is moving, and most likely engine longevity as well.
Your comparison was to have to take a 5.9L 6 cylinder diesel (sure, it has turbo), and compare it with the 8.1 vortec. 8 cylinders, and more than 2L extra displacement. Even then, the Cummins is putting out that 440 TQ at under 2k RPM. The vortec has it by a mere 15 ft/lb, but isn't making it until around 3k.
If you put those two engines in an otherwise identical truck, I would put money on the diesel to triumph. I'm not saying a gas engine is incapable, nor that you CAN'T beat a diesel with a gas engine, but how much different do you need those engines to be to make that happen?
The blowing soot thing though... ugh... diesels have come a long way to NOT be that dirty. It drives me crazy.
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