Probably also a difference between tires and wheels that are sitting with weight on them and tires and wheels that are just sitting there ummounted on a car.
In my nitrogen filled GTR tires which have lost little to no N2 over the last 5 years, it sat during this winter for 3 months without moving. Came out to start it up, 3 tires lost no N2, and 1 tire was down from 28lbs (cold) to 12lbs. Filled it up with air and drove it around....and it hasn't lost any more air in the ensuing 2 months.
Aside from the strange massive loss during those 3 winter months, it's pretty cool to never have to fill your tires up for 5 years.
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