On the topic of wheel colours, is it worth having them in a separate sheet in the spreadsheet? Without having an encyclopedic knowledge of wheel brands it's pretty difficult to find them among the other 6000+ colours.
Also, Shade Green under Mazda is listed as Metal Flake but only has one set of values listed instead of two. Setting the flake to match the base looks decent, but other colours like that still explicitly have the values listed twice. There's also 'Infini III Green' listed which as far as I'm aware is Shade Green, and in the list the hue and saturation do match between the two already.
Also, Shade Green under Mazda is listed as Metal Flake but only has one set of values listed instead of two. Setting the flake to match the base looks decent, but other colours like that still explicitly have the values listed twice. There's also 'Infini III Green' listed which as far as I'm aware is Shade Green, and in the list the hue and saturation do match between the two already.