The average price of gas at the pump has topped $4 in the US for the first time in nearly four years as the Iran war continues to push up fuel prices. The national average for a gallon of regular gasoline is now $4.02, more than a dollar higher than when the war began, according to the AAA motoring organisation. The price of diesel is also around $1.70 higher. The effective closure of the Strait of Hormuz, a key waterway, for the past month has meant the production and transportation of energy