I've noticed this when working the airport Queues. Some cars are NOT XL (only have 5 seats) and or are gray, charcoal or some other color other than Black. I've also had Pax that I picked up either call me, after accept their ping and ask if I had 6 seats, or tell me they had to cancel the last XL as it wasn't an XL and only had 4-5 seats. I asked U/L drivers how they got past this issue and they said the Greenlight Hub changed the color of their vehicle for them. As to XL, I know some SUV have the 7 seat as an option and I assume these drivers lied when the added their less than 7 pax vehicle.