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

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

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 ...