Owners of plug-in hybrids that were powered by electricity and petrol have had to pay petrol tax, but not to the same level as petrol equivalent vehicles, Brown said. 'Transitioning EVs and plug-in hybrids to RUC is the first step in delivering on the National-ACT coalition commitment to bring all vehicles into the RUC system.' 'Petrol tax and distance-based RUC are paid by road users to contribute to the costs of maintaining our roads, but EVs and plug-in hybrids have been exempted from RUC,' he said.