I thought I'd post this query/comment in Off-topic, as it doesn't really relate to the LEAF specifically.
I was swapping out my furnace filter this weekend, following manufacturer's instructions, when I noticed the type of paper material used. It's very similar to the Hepa filter we use in our cars.
The home filter needs to be swapped out every 90 days. But the Auto filter can remain in the car for a year. This past fall, when I pulled out my filter from the LEAF, it was about the same light grey colour as the home filter.
I would imagine that the car filter would be exposed to harsher conditions than my home. Is this some kind of marketing gimmick? Or should we be swapping out the car filter more frequently?