Aye. Curiously enough this one (waves at '04 9-3) isn't so fussy with the fronts now at just under 3mm. I'm undecided if this is because the rears are not as good quality or if the Michelins have always felt this way! :-)
In my other machines there's been a big difference at this point onwards, such that when the tread depth reaches 3mm, the tyres are in for the chop. Guess what I'm planning on doing on Saturday?