Agreed. That is what I did. I didn't use the "exact" same spots, keeping in mind that I have 4 seats in a row and not 3 so I did the first few at the "middle crack" of the two middle seats in the front row.
#1 was against the back of the headrest, #2 was at the front of the seat, #3 was the middle of seat, #4 was just in front of the seat, #5 and #6 were on the outside edges of the two middle seats against the head rest, #7 and #8 were in the middle of each of the outside two seats in the rear row, against the head rest.
So the mic got moved each time, but focused on the middle two seats in the front row instead of me doing a measurement at just about every seat.
We are going to watch a movie tonight so it will be interesting to see if there is a difference.
M60s, VP180, VP150, QS8s, SVS 20-39PCi, HTPC, JVC RS45, Onkyo TX-NR709, Shakers