the 6.7 is not designed to be a mall crawler - it is a work engine - likes to and needs to be worked. Commuting back and forth to work is not going to make it work. Do a little research - several people have broken down all of the costs - original purchase price - operating cost - in my part of New Jersey diesel fuel is between .35 & .50 cents per gallon more than regular gas. Maintenance costs etc.
Bottom line - weather it makes sense or not - if you want a diesel truck - then get it - otherwise you will not be happy. Been there done that - everything does not have to make sense or be practical - do what puts a smile on ya face !