My partner had a diesel car for awhile, and it seemed she was always having to top up RUCS. And I drive a petrol car 40-50,000kms per year, I'd need a direct debit each week!
I'm curious where the kms break-even will be when compared to current registration. At the moment it's an all you can eat system for passenger cars. In future some will pay more, maybe some will pay less.