Don't laugh, I thought green signified nitrogen fill but my salesperson insisted my '19 GT1 RWD (took delivery today and naturally it had to be overcast with occasional showers so wait for pictures) has nitrogen fill but the stem caps are blue. Nowhere in paperbark does it say the tires are nitrogen fill.
That’s what the dealer I bought mine from did. They put the green caps on and said they are nitrogen filled. Didn’t bother me since I wasn’t going to keep paying for them to keep filling it with nitrogen
Yes, green "normally" means nitrogen.
Blue was probably just what someone found in the parts bin when putting yours together. As for whether or not it currently has nitrogen fill? Who knows. Light $10 on fire and tell everyone there's nitrogen in there.
Mine had gray caps from the dealer.