Most everybody's gold is held in a vault. You rarely get to touch it. But you don't have to. You know you can't take a bar and go buy a car. But you don't care.
I expect if I walked into a car dealership able to pay for a car in gold they would gladly accept it if it meant a sale.
Try it. Unless it's obviously 10x the car's value or something... they'll tell you to take it to a bank first.
Even if it was 10x the car's value. How would a car dealership know it was real 24k gold?