I've been running at the pressures on the data plate (39 all around if I recall). The ride seems really harsh to me. Tires are Michelin Latitude Tour HP 255-18 no-seasons. (Which, by the way, absolutely suck in snow, slush and ice). I have the sport suspension, so I expect it to be firm, but it just seems a bit rough.

I'll probably play around with reducing the pressures a couple pounds to see if it helps but I was curious what others are doing.

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'04 E53 X5 4.4i
'05 Mazdaspeed MX-5
'00 Saab 9-3 SE Cabrio