The 2007 Chevy Tahoe features an all-new body with more rounded lines, fully wrapped front lower body fascia that eliminates air-grabbing gaps, doors that wrap over the rocker panels, a more steeply raked windshield (tilted back from 50 degrees on the previous model to 57 degrees on the new Tahoe) and a radio antenna that has moved from an exterior position into the rear quarter-window glass. Such detail was paid to making the new Tahoe more smooth and aerodynamic that even the little lip on the gas fuel filler door has been eliminated.

The result of the more streamlined body is better fuel economy, according to GM. Automotive engineers judge wind-cheating aerodynamics by a factor known as the coefficient of drag. The lower the number, the slicker the vehicle. The 2007 Tahoe has a Cd of 0.363. For comparison, the smaller but extremely sporty Porsche Cayenne emerges from the wind tunnel at 0.38.

In the case of the 2007 Tahoe, a smoother appearance doesn't mean a softer appearance. The new Tahoe is built on a new and wider frame. As a result, the front track (the area spanned by the front wheels) has increased by more than three inches and the rear track has grown by an inch, resulting in a wider, stronger-looking stance. A pair of bulges in the hood enhances the vehicle's visual strength.

Further boosting the Tahoe's stance are standard 17-inch wheels. The 2005 Tahoe rode on 16-inch wheels. But not only are 17s standard on the new Tahoe LS and LT, but 20-inch wheels are standard on the LTZ and optional on the LT.