GM mods the Sierra hybrid pickup: aerodynamic tweaks + LRR

[MetroMPG]

From the Winding Road:

In addition to the hybrid system, GM added LRR tires plus a few aero mods - things that could be on non-hybrid models too...

Additional details specific to the Sierra Hybrid include aerodynamic aids. A slightly deeper front air dam and a tonneau cover for the bed reduce air drag, fostering maximum efficiency.

Hmm - a deeper air dam. Remember what Ford did to it's '08 Superduty pickups?

Ecomodder - New: Ford mods their Super Duty pickups ... chin spoiler + final drive changes

[Big Dave]

I'm so unimpressed about GM and Ford chin spoilers.

My 2000 F-350 had a chin spoiler with 7.5 inches clearance - the least that will go over a parking curb.