Steve,
NO, but not because it may not improve Power, Performance or Economy.....I live in Stanley in the remote mountains of Central Idaho and we have not gone anywhere since Christmas. I am pretty anal about checking mileage on our trips to Boise, IDAHO so I have a pretty good average to compare to. Soon as we make a couple trips on something besides snow and ice locally....maybe I'll have a comparison. I do run the FIPK
K&N kit on my F-250 SD 4x4 V-10 with the cold
air intake mod.....and have no complaints.