My father is looking at getting a new 6.7 he is wanted to know honest MPG on these trucks stock. It will be a CCLB 4x4 mainly used to tow the boat, and a small tractor. Please let me know honest calculations, as this truck will remain stock no tunes or deletes. Thanks. Also any other advice about these truck would be nice, I dont know much about dodges. It we either be a 2012 brand new or a slightly used 2010-2011 Thanks in advance.