[RSW]

Originally Posted by vdoh182

5.3 liter silverado with 6 speed gets 14/20, compared to 14/19 in the regular 4x4 model, the 6 speed doesnt seem to have helped much.

http://media.gm.com/us/chevrolet/en/...o/09index.html

It'd be hard to get much more highway mileage out of an enormous, tall brick (i.e, truck) even with 8 speeds.