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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by sharkman:
I appreciate your candidness. The reason I am complaining is that the new TrailBlazer SS has a 395HP LS2 engine (the same as the new Corvette). The Blazer weighs the same as the H3 AND it is rated with the same gas mileage (16/19). I asked HUMMER and Chevrolet how this can be possible: how 2 similar weighing vehicles (outside of aerodynamics) can have 2 totally different engines (a V8 vs an inline 5) and get the same gas milegae! Hell, if I know about the SS, I may have purchased it over the H3 (you get power AND great gas mileage). The answer given to me was, "I know it is frustrating, but I don't know how to explain it." </div></BLOCKQUOTE>

it takes less throttle input to move a vehicle with a large V8 with torque to spare, versus a five cylinder that does not have torque to spare. Yes, a V8 with less throttle input is using more fuel than the five cylinder using the same throttle input, but the five cylinder would require a great throttle opening. This would only affect starts from a stop, unless you were passing.
Also, even though the trailblazer is not considered aerodynamic, it is extremely aerodynamic when compared to the Hummer H3, which is similar to moving a wall down the road.
I'm also guessing, but I would guess the trailblazer weighs in at about 500 pounds or less than the H3. The H3 has a heavier frame, extra cross members, and heavier front/rear axles and transfer case.
As I have said earlier, the fuel mileage figures given are based upon a Fed Regulation on how to determine fuel mileage. These tests are performed under ideal condition, and really do not reflect actual driving done by you or me.
It does sound like you not getting as good of mileage as others, but it could be due to your driving habits versus others, the wind, the altitude, etc.
I know from what I have seen so far with my mileage, I have no complaints.