Here is the kicker to your dilemma. I recently read a technical review of the TB. The posted mileage 15/21 on the sticker are the numbers that were estimated when tested with a standard equipment Trailblazer. The standard TB has a 3:73 rear end ratio. The EPA does not require that these numbers be changed with any optional equipment installed. The TB equipped with the towing package has a 4:10 rear end ratio which severely affects the projected MPG. I also have crappy mileage which is why I searched for this info. I guess that is the price we pay for having the most powerful mid-size SUV on the market.
Nor Cal LTZ (2002 LTZ 4x4)
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