Petrol prices have already risen by an average of more than 40c a litre since the end of June. (Chris Pavlich/AAP PHOTOS)Treasurer Jim Chalmers has written to the Australian Competition and Consumer Commission asking for increased scrutiny of fuel prices to ensure they weren't being artificially inflated. Mr Khoury said it was the job of the regulator to independently track fuel prices and impost penalties. Higher fuel prices could result in higher grocery prices as the full excise kicks back in. High and unstable fuel prices are making life difficult for the trucking sector.