I will not be getting my new car from teh sale yard by offering...

I will not be getting my new car from teh sale yard by offering 20 oz of gold in coins! I can almost gaurentee they will look at me sideways!

Not while the banks are open and inflation is under control, you won't. I do see how small denomination PM coins would be useful if we ever had a "bank holiday" which is being rumoured in the US and in times of hyper-inflation your car dealer may even give discount for gold so his capital doesn't shrink while awaiting his next shipment of vehicles.