I heard a lot about the pressurized tank when I saw the car.
I didn't think about if it had to be one material or another to pressurize it. Sure looked like plastic from under the back of the car! I thought that's what many manufacturers were using now, as it can't rust out.
Maybe it's just a plastic cover or coating? I suppose a nice thick coat of powdercoat paint could look like that too.
I didn't actually bang on the tank to listen to it.
