I know there are other posts about this, but I don't see "my" type of truck (if there is any difference) . I have a 15' 3500 dually. 8" lift with 35X 12.5 20s being powered by a 6.7l Cummins. Towing a 7k cargo trailer I am averaging 12ish mpg (hand calculated). Can I expect more when deleted, and if so is it enough to make a difference? Thanks in advance. Sorry if this is repetitive.