stock to stock, the gassers are more quick, but don't tow chit
I had an '07' 1500hd and it was an awesome truck. The auto 4x4 feature was great for pulling off the line when it was wet (or dry) like having AWD. Although it got dusted on the freeway by a ram with the cummins and stacked programmers, oh yeah, I had a d1-sc procharger too, that beating is what led me to the Duramax
the 6.2 also comes with the VVT technology, which isn't as awesome as it sounds but will net you a couple mpg's more, more due to the lower rear end gear ratio than what can be had in say, a 1500hd with the 6.0L and the 4.10 rear end
I got 12mpg in my 1500hd and now with the Trailblazer SS, which is basically the same set up with an LS2 aluminum block instead of the LQ4/9 iron block, I'm getting about the same mpg; 12-14mpg mixed driving and about 17hwy (6.0L w/4.10 rear) but it's AWD....
there's always the 4.8L V-8, it's a great little motor, I had a wt trimmed single cab 4x4 back in the day and with an intake and a flow master it would get 20mpg hwy:thumb: a set of air bags in the rear and it would haul your camper. it was pretty damn quick for what it was too
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