If we revamp the fuel duty tax, why not introduce a carbon tax to pay for the impact of CO2 emissions on climate? This would make the fuel duty tax insignificant (the cost of climate change is more or less infinite now, given the current trends).

Then, we can rethink the whole system and realize road-based transportation with private cars is not sustainable. And then, we can forget about fuel duty / energy tax because we have whole societies to redesign :)