http://forums.beyond.ca/st/209832/nitrogen-in-tires/
http://forums.beyond.ca/st/215410/nitrogen-for-tires/
Some of the post are humorous to read. Not too sure why the fuss. It’s grade school science.
I guess the point was is it economical for a street car? Most likely not unless you weld and have access to Nitrogen readily. If people are paying $100 then I should really think about starting a Nitrogen filling station – a nitrogen tank is only $100 + $100 for the tank.
A good tire gauge and regular checking would be more beneficial. On the other hand it is an advantage even for the AutoX where tire temperature and pressures affect the slip angle.