2009-vs-2010 Tahoe MPG change

[mad max]

Does anyone know what, if anything, they did to raise the MPG rating from 14-20 to 15-21 from 2009 to 2010 models, or is it just BS? All the new 2010 stickers seem to show the increase.

 

[Rollin Thunder]

I think they messed with the aerodynamics and the MDS (cylinder shut off).

 

[05Yukon]

I believe they also added VVT to the 5.3