In fact, I can tell the difference between a Taurus and a Sable. To be more precise, I can tell you the make and model (and model year, give or take a few) of 99% of cars within my field of view at any given time. Whether I can design cars or not is open to opinion, but personally, I don't consider myself very good at designing cars (though I am learning). I know basic engine mechanics, I can do basic stuff like change wiper fluid and put on winter tires, and I could probably tell you the engine configuration and displacement of your car's engine. (Unless you have a Bricklin SV-1 and a restomod 1959 Studebaker.)
Ideally, I would like a position in a mechanic's shop to aid in spoon-based engine rebuilds.