Ok, we settle this at our house by using color, let's take the 'brown car' which happens to be an S10 pickup, or the 'red car' which was a VW New Beetle.
A previous poster asked what do you say if you're a two (or more...) Jeep family? That should be also easy enough--"let's take the new one, let's take the small one, let's take the 4x4, etc."
Here's a whole scenerio on "what is a Jeep?" While trying to license my military jeep--it's pretty much original--not restored, but authentic Korean War model. (I usually tell folks that I brought it back from the War in my hold baggage...)
Well, anyway, going to the CA DMV is never a pleasant experience, and always a challenge, but now I have a vehicle that's never been registered in CA, the title I got (from the widow of my friend who was restoring this...) was a "green slip" from Oregon, last registered 1959. In CA, you'd need to show a "non-operational" status with the address/facility where the vehicle was stored and swear that it hadn't been "wheels down" on a public roadway. So my "personal cop" offered to sign off on the peace officer inspection slip, not fully knowing what the vehicle requirements were for transferred military vehicles in 1949. But we decided to chance it.
Things were going smoothly at the DMV, I successfully answered all those statements requiring raising my right hand, until they asked that final question, "what type of vehicle is it: car, truck, etc. "
I said, "neither, it's a Jeep!" I don't want her to think it is a truck, 'cause in CA, trucks have higher license fees due to the 'tonnage' requairement.
(Although the military nomenclature states, "Truck, utility, 1/4 ton, 4x4, M38")
"OK," she says, "let's assume it's a car."
"As you wish", I says, not really agreeing, but you do not deliberatly anger these folks!
"OK" she asks, "is it a coupe, sedan or station wagan?"
I said, "neither--its a jeep!"
"OK" she says, "let's call it a sedan. How many doors?"
I say, "it's a jeep--no doors!"
"How do you get in?" she asks. By now, I'm figuring this person as never seen an open jeep before in her life, and don't want to anger her, 'cause it is She (who must be obeyed...) who stands in the way of the license plate and registration I so dearly need.
Finally, a co-worker/friend of hers walks by, after overhearing our verbal exchange and says, "just show it as a two door. You don't need any more grief in filling this on the computer!" (WOW! they're 'afraid' of the computer--made my old IBM employee heart swell!)
So, my Jeep--a "real, original Jeep" is a 2 door sedan as far as CA is concerned!