Thread: Nitrogen tires
View Single Post
Old 08-15-2011, 11:40 AM   #31 (permalink)
roflwaffle
Master EcoModder
 
roflwaffle's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 1,490

Camryaro - '92 Toyota Camry LE V6
90 day: 31.12 mpg (US)

Red - '00 Honda Insight

Prius - '05 Toyota Prius

3 - '18 Tesla Model 3
90 day: 152.47 mpg (US)
Thanks: 349
Thanked 120 Times in 79 Posts
If the rate of leakage of oxygen is significantly greater than nitrogen then after a few fills most people will end up at 95+% nitrogen anyway provided they don't let their tires drop more than a few PSI, and if they're letting their pressure drop more than a few PSI anyway they shouldn't be worrying about what they're putting in their tires.

Quote:
Note also that if you fill and top off with air, the percentage of N2 will gradually increase over time; at first you lose about half O2 and half N2, but you top off with a mixture of 78% N2 and 22% O2. So if you fill your tires with air and they initially lose about a psi a month, then after a year of this, it’s down to mostly N2 inside the tire, and the leakdown rate should slow down. For many motorcyclists, tires don’t make it through a season before replacement, so the effect is negligible; but if your car tires last four years, then by using air in them you’ve actually gotten about 3/4 of the benefit of a N2 fill, without the expense.
Link.

  Reply With Quote