I remember from my flying days that: “The addition of water vapor to air (making the air humid) reduces the density of the air, which may at first appear count

I remember from my flying days that: “The addition of water vapor to air (making the air humid) reduces the density of the air, which may at first appear counter-intuitive. This occurs because the molar mass of water (18 g/mol) is less than the molar mass of dry air.” (Not sure I like the language above but that’s how Wikipedia says it) Is this potential effect accounted for in your numbers? I.e. What happens to the molar mass of Martian atmosphere when Martian dust is suspended in it? At any rate, dust is bad for the moving parts of flying machines.