I think I've posted this here before. The people who can most afford to
put nitrogen in their tires will probably need it least. Most high-end
tires have a membrane included in the carcass sandwich that slows
molecular migration to a crawl. I've stored some high-end tires for a
year and they only dropped a pound or two.
The rule of thumb in the tire industry is one psi lost per month on
tires without the membrane and about a tenth of that for tires with the
membrane. At that rate, even if people don't have premium tires, it's a
non-issue because everyone is checking their tire pressures each month,
right? Right? :)
Jon
Mullen, Tim wrote:
> I believe that the claim for better gas mileage is based on the idea
> that the tires will remain at the proper inflation pressure, which in
> turn will give better gas mileage. But so would checking/adjusting your
> air pressure more often.
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