I know one of you in that Jersey area crew had this same deal as I did out here many time. Put a higher flash custom converter in a car and the cruise RPM dropped 200-300 rpm because it was tighter in that operating/tq range.
that was DJVCUDA . he had a mp unit in the car originally. put a dynamic 9.5" in it and was much faster out the whole and cruised the highway at like 400rpm lower... its pretty amazing how efficient they are while allowing them to flash higher...