since "air" is 80% N₂ that does make plenty of sense. I thought I saw a video where a guy weighed a tire before and after N₂ fill and it was a measurable difference.

A quick search of YouTube shows the real difference being the change in pressure caused by the amount of water vapor in a typical air fill.

I recently had TPMS complain on E70 just from ambient temperature drop.

I've noticed about 1psi drop per 10° F ambient. That's enough in itself to cause problems.

More research into O₂ filtering though the rubber: if that's the case simply refilling as pressure depleted will increase the N₂ ratio but I have a feeling the partial pressure from water vapor likey has more effect on the ambient temperature effect.

I definitely would lean on the zero point for consumers. Use filtered/dry air to achieve the same effect

Airplanes use N₂ so their tires are less of a fire risk combined with the magnesium rims.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)