Mazda3-bumpy ride
 

I was disappointed to find that my 2009 was clanking over bumps and small ruts. It felt like cheap, poorly-designed setup. Checking tire pressures, they were in the 33-34 lb. range. Sticker calls for 32 lb. After setting to 32, the problem was still there. So I set them to 30 lb. Finally the problem went away, with only occasuional clunks. (I have the 205/50-R17 tires). Of course the handling is degraded some, feels like I'm riding on marshmallows.