My Chevy Tahoe Commercial

Chevy did a foolish thing in early 2006. They held a sort of 'American Idol' contest, where idle Americans could use a nifty online editing software to turn stock footage of their new Tahoe SUV into commercials, with music and custom text. The Eco crowd got hold of it, and had a field day. For this submission, I actually did the math, comparing the numbers on the Tahoe to their Uplander van with optional 4WD and engine. Soon after, they nixed 4WD Uplanders. Hmmm, I wonder why?