The Limo has 3 shade of windows
Ah, there it is: one of the very few instances of someone using a subtractive material for the windows. But this is one of the examples I already mentioned when I described my solution: it's only subtractive, and so the color is completely flat and it has no reaction to shadows or other lights.
This format literally gets the best of both worlds: it darkens, as a window should, without being completely flat; and it's light, without being toothpasty.
Only additive:
Combined:
Only subtractive:
Combined: