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A couple things I would like to throw into the discussion:
1) You have an AWD car so your front end will be slightly higher than the rear of your car, that is just how the AWDs are built.
2) Going from 17s to 18s is not that big of a difference (moving from 45 to 40 series). There is a pretty noticeable jump between 18 and 19s so I wouldn't worry too much if I were you.
3) You can't 'calibrate' your speedo to a certain size tire. You can go in the 'tire section' of this forum and calculate what the difference would read on your speedo according to your different size tires.
4) 255/40-18 will most likely not fit on the front unless you roll your fenders. 255 is the max you can go with stock fenders up front.
5) This might be a no brainer but keep all the tire sizes the same on all four corners because you have AWD.
Welcome to the forum and hope this helped somewhat!
-Mike
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