Hang a 16k 5th behind a new 2014-15 diesel and a gasser, and see which one wins. Oh wait that is way beyond the capability of the current gassers. That is a real world comparison that applies to many here.
Now hang a 12k trailer behind the same two trucks above and see which one is up the Davis Dam hill first.
Both of these are "which should I buy real life questions". The 6.4 and 6.2 would satisfy some, the 6.0 most likely will disappoint most with the 12k trailer. The two 6.7's and 6.6 will put a big smile on ones face, running up Davis Dam hill with either trailer.
Chris
