I seen a road and track test drive against the cheyenne and x5, the x5 handled better and had better pick up, now that was against the 4.6is .it is a little different than the 4.8 i ,the new 4.8 i is 500lb more than the 4.6is.
And the cheyanne was 1.8 seconds lower then the slower and the 4.6is