I've had my car for about 1 1/2 months. It rides a little rough and so I checked the tire pressure. The tires were 36psi. I have the original 17's. The manual says the tire pressure should be 30 front and back unless I have a very large cargo. Thus, I compromised and just put them at 32. (haven't driven it yet to see if any difference). What are your thoughts about tire pressure for the original 17 tires? Thanks for any help.