Motorists in Australia are being urged to fill up with fuel before a potential rise in the price of crude oil flows through to the bowser.The US and Israeli strikes on Iran are raising concerns that retaliations in the Middle East could disrupt the flow of oil, which is heavily dependent on the Strait of Hormuz.Iran, which controls the waterway, also manages the world's third-largest proven oil reserves.LIVE UPDATES: Iran's chilling vow of revenge as supreme leader's death confirmedUS has