Using the Ram as a commuter vehicle and other light-load situations that produce soot will result in more regenerations, costing fuel mileage. Not only would it take a long time to pay for a tuner and delete package (if you can still find them), if you get stopped even once in a roadside check, you will wish you had never tampered with emissions equipment. For at least a decade and a half, some people have reveled in smoke shows and now the EPA has clamped down. Also realize that many buyers of emissions delete stuff exaggerate the mileage benefits they actually get, and also there is a big tendency to "remember" higher mpg from older Rams than they actually got. For example, I got 17-19 with my 1997 215 HP on the highway, and maybe 2 mpg more after advancing timing--driving solo at 70 mph. My 2004 with Smarty to add timing (or the TST box) is a couple mpg below that, but the truck weighs about 1100 lb. more, plus added "stuff" I usually carry. People "remember" 22-25 mpg from First Gen Rams, but my son's 1990 regular cab 2WD, about the best you could get for mpg with the automatic, gets a best of 19.