National want to go to a RUCs for everyone system, which I think is the best way to handle vehicles that have multiple fuel sources such as plug in hybrids.
I have always though that RUC for all was a much better system. Having it built into fuel as an extra tax is dumb.
A big V8 that gets 15l/100km and weighs the same as a prius that gets 5l/100km are paying vastly different amounts of tax for a very similar amount of wear and tear.
Another example is our people mover (Mazda Premacy) gets around 10-11l/100km, once the kids are a bit bigger we will get a smaller much more efficient car, the wear and tear caused by our Premacy is not more than a Prius/Tesla/Focus/Corolla…yet we pay more in tax than any of those vehicles.