If you're not pulling or pushing, what's the need for a truck? Haul a few hay bales? What type of MPG do you think you'll get in a 2013 Dmax? Not much better! As was posted; step over a dime to pick up a penny is true.
With diesel fuel running about $.50-1.00 more per gal. up here in WI, the MPG is irrelevant.
What did I do: added a 2013 Ford Focus S model. (that would be bare bones) My Dmax just sits for now. The fuel savings alone pays the monthly calculated cost of the Focus.