Traditionally, car tires have been filled with compressed air. Air is 78 percent nitrogen and just under 21 percent oxygen, ...

so devotees won't really realize a huge benefit from switching to pure nitrogen. Not only that, but leakage is likely to be more significant at the tire bead or around the valve than through the ...

That would be a mistake, Pszczolkowski says. The NHTSA study also found that regular air escapes tires at a higher rate than ...