Speaking of JD Powers.....see this article about how they survey. The reason the Hummer was rated dead last? Most of the complaints about "defects" were not rattles or mechanicle problems, but people complaining that it got low gas mileage.

They bought a Hummer, with a sticker on the door (mileage in big print) and numerous articles in print and on tv that said it gets low mileage.....then called it a "defect" equal to the engine blowing up and the wheels falling off. <img src="/forums/images/graemlins/rolleyes.gif" alt="" />

article here; good for 2 weeks. (See page 2)

To excerpt a small part of it:
One gripe: In the new car quality survey, a car's basic attributes, gas mileage, and the placement of cup holders, for example, are lumped in with problems like rattles, buzzes, and broken equipment. Carmakers believe the survey should measure only the defects. In 2003, for example, Hummer scored the lowest of any car. The main complaint was poor mileage, something that presumably would be obvious to anybody buying the massive vehicles