yeah, good point, I kind of heard the news report, heard it was about cars and didn't pay much more attention. There is a good chance I miss heard the mpg savings. Regardless of any energy savings you might get, I have to add air to my bicycle tires a little less than twice a week, for my car it's better, but still once per month. This means to keep them at proper inflation you would probably need your own nitrogen tank system.

So why do they use Nitrogen in Nascar?