While looking at the tire information on the driver side door area, I noticed the max vehicle carrying capacity is stated at 340 pounds (US). I'm sure I've looked at this in other vehicles, but I don't recall it being so low. Is this usually the weight at which it becomes detrimental to the ride quality or just some value they use in calculating expected fuel economy (like you can expect some mpg with less than 340lbs or so)? I'm 180 pounds and gave my friend (who's about 220) a lift. I didn't really see a noticeable difference in city driving, even though we were well over the limit.