In my early days I was not yet an executive for a fortune 500 company managing a 1,000 person sales force for a division of Pfizer out of NYC ---I started work with DuPont Automotive finishes In Charlotte, NC. We shipped automotive refinishing materials to body shops and manufacturers of trucks, school buses, etc all over the Southeast. Prior to that stint I thought Manual Labor was an hispanic guy, but quickly found out what it truly was when unloading those boxcars of paint arriving at the distribution center---not to mention working at New Dixie Truck Lines during this same time handling freight from 7 pm until midnight 4 evenings a week ---but I digress. We stocked a few thousand colors plus custom mixed additional ones. Back then the #1 car color was white which came in many shades of white ---but white was #1. As I remember the two least favorite colors based on shipments were brown and green, which were tied for least favorite. (Same for men's suits then and today.)
I believe that the #1 car color today consists of the various hues of silver metallic but from my own observations I'd say that brown and green are still the least popular colors. The "june bug" green shades are my personal least favorite.
But----whoever spends the money is certainly entitled to whatever color they like.
Just my 2 centavos.