Gas prices are surging across the US as the war with Iran continues to rattle global energy markets — with crude oil spiking 4% and American diesel topping $5 a gallon Tuesday, inflicting pain at the pump. Brent crude rose as high as $103 a barrel as US allies rebuffed President Trump’s demands to help surmount Iran’s blockade of the vital Strait of Hormuz — which saw the transport of 20% of the world’s oil supply before the war, when Brent crude traded in the low $70s. US benchmark West Texas