I just went through this when looking for a truck. I was looking at both the Duramax and the 6.2 and there really wasn’t a big difference in price from 22 to 23. A few thousand bucks with really isn’t much when you consider what your payments will be on a 60 something thousand dollar truck. What really makes the biggest difference is what options you choose. A leather Z71 opted RST could end up being five grand more than one with cloth and the basic 4wd.