so far my truck has gotten 18.5 mpg on the highway with WINTER fuel, this is exactly what my '93 dodge cummins single cab 2wd truck got on the same fuel. that truck weighed 2000#'s less was not 4wd and was much lighter, it also had no electronics, cat, or for that matter any pollution controls. these trucks are regarded as getting the best mileage of pretty much any diesel full size truck.

the point is my 2011 is matching what that truck did, as a result at this point I think its foolish to remove the pollution controls on these trucks, if they drank fuel like the 6.4's then yeah by all means get rid of it, but they don't.