Originally Posted by kantonm

I had a toyota MR2 and the prevoius owner had the tires at 45psi...when i lowered the pressure I noticed that the tires seemed a little quieter, just a thought.
Also the advantages of Nitrogen for regular street drivers is that your pressure lights won't go off every time it gets a little colder outside...really annoying..
My father raced porsches for years and they all overinflated the tires on track and slalom days to increase the grip and response, maybe nissan is doing this to increase the handling for test drives... they ran as high as 50psi without tire damage, however the tires were deflated to normal for street or storage..