My 2000 Sierra Z71 looked better, fit better, rode better and did almost everything better than my current 2013 Z71 which is bigger, harder to park, rides rougher and with the same 5.3 and a 6 speed Auto (instead of the 4 in the 2000)on a good day only gets 1, maybe 2 mpg better overall. The only new features I like are the dual climate control and the rearview camera. The rest is just crap. Expensive if it breaks crap. I'm not sure how much longer I'll keep it.
I actually preferred the Tacoma I had in between.
Dwight, hang on to that Silverado as long as you can.