"We've seen a lot of restraint from the oil companies in the past few weeks," he said, adding that if global oil prices continued to fall it would "cushion the blow" of upcoming price rises in Australia.Khoury said that price rises caused by the end of the fuel excise discount wouldn't happen overnight So please don't go out and panic buy."Khoury told SBS News that, by the time the discount expires, it's likely the increase will be closer to 17 cents rather than the extended excise reduction rate of 16 cents."We think it's going to be another cent because of the inflation adjustment, which also just happens to land on the same day [Monday] they do that twice a year." Just how much cost will be passed on to the consumer depends on individual service stations, Khoury added."We don't want people to panic because some service stations will go up on Monday and others won't; it really depends on when they sell their stock." In any case, the fuel excise discount is being wound up against the backdrop of retail prices that are already steadily rising