I am looking to build a 3500 cc srw i want to put a utility body on it so a chassis cab or a regular build could be ordered and the upfitter will trade the bed in against the cost of the body. with this said either engine could be ordered if i desired. My interests also include having the pto option installed on the allison. Does anyone have any head to head mpg or other information pertaining to the differences between these engines. I hope to order it by mid december. Anyone know of any good dealers in Southern NJ not adversed to traveling for it but at least looking for a good deal and a personable dealership. thanks again.

Try the following link for spec's on the Duramax Family of Engines. Does not have details on MPG, however still useful.

www.duramaxdieselspecs.com