I'd bet that the MPG figures GM lists for the Trailblazer are not with that 4.10 rear that you'd need for towing.

A 1/2 ton 5.3L Suburban with the 3.42 rear is rated for 7500 lbs towing and gets within a few MPG of what's listed for the Trailblazer.

When all's said and done I wonder how different the fuel economy really is.

-Bob
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I hear you on this one. I get about the same mileage towing with a 95 GMC Vandura 2500, w/TBI 350 that I did towing with an 00 Jeep Cherokee 4 liter. I just carry more stuff and don't feel like I am walking a tigh-rope while doing it.

Chris