As weird as it seems, it may partly be external pressure.
My precise height is 5’11 and a half.
Each times it comes up in conversation, I tend to say I am 5’11, but people close to me insist I am 6’.
I feel like nobody would insist if I was 5’10 and a half that I am 5’11, it’s just the magic 6’ number that make people weird.
I am not a car person.
It is unconcievable to me that you can identify the brand of a car from such a partial picture.