Hi Blueprint Me, I can't remember the revs the stock XR6 used to sit on at 110km/h (it's been 5 yrs since I sold her), it was probably in the same range as your auto as you say, but my ZF sits under 2000pm. I think the utes used to weigh a tad more than the sedans (I could be wrong). I just remember driving her to work and back and having to fill up just short of a fortnight (around 60k's round trip from near Perth airport to just outside Fremantle and back). I used to do 1:2, 1 tank of 95 to 2 tanks of 91. It just annoyed me that the XR8 guys were getting the same results lol. Anyway, I couldn't be happier with the ZF huge difference, I'm just saving to get her tuned and hopefully that will giver her better economy as well as power.... only when needed lol. Cheers