First of all: Congratulations and welcome to the site.
Second: Are you sure its an F-450 and not an E-450? The Super C's use an F-450 with a diesel engine, but all the rest use E-450 (van) chassis with the V-10.
Third: Given your mpg report of 6mpg I'm going with its an E-450.
Sadly you are going to get what you are going to get. 6mpg is a little bit on the low side but not outrageous. After a few more thousand miles you'll probably pick up another mpg as the engine wears in--a common thing with the V-10.
There really isn't much you can do with a V-10 to improve its thirst. Sure you can add Banks and tunes, etc. but you'll approach diminishing returns with more and more $$ added to get that extra .2 mpg...
|