I think it's better ''You drive the car as much as you want''
Yes, it does sound better. But it would even be nicer to say: 'You can drive the car as often as you want (to). I don't think the official translation is standard English, but I'm not a native speaker.
'however much' is not used in English it is either 'however you want' or 'as much as you want'
"Quanto" for "however" is just wrong. "How much" works.
It is bad English!
"how much you want" should also be accepted.
Nobody is talking like that
However much seems strange to me