A fuel boss says he expects prices to climb 15 - 20 cents per litre in coming weeks, after new developments in the US - Iran conflict.Earlier today, a tanker was reportedly struck by an unknown projectile off Saudi Arabia's coast.It followed US President Donald Trump threatening to bomb Iranian infrastructure in response to any attacks on ships travelling through the Strait of Hormuz.Waitomo Group chief executive Simon Parham told Checkpoint he expected those developments, as well as Ukranian drone strikes on Russian refineries, would push prices up."I'd forecast that we'd be going close to $3, just a little bit under. But on diesel, about $2.50. So that's where I'd sort of see it pan out in the next one to two weeks."But Parnham did not expect prices to get as high as previous peaks in March and April."The reason for that is that there has been a rebalancing in the system, with crude coming from countries such as the United States, Brazil, and Guyana across to refineries."China had also relaxed its restrictions on petrol and diesel exports and were selling more to international markets, Parham said.He said oil markets no longer seemed to be reacting to every word that President Trump said."I think the market... started to shrug their shoulders and say this is the new normal... the days of him talking the market up or down seem to have gone."People in New Zealand had started to buy more petrol after demand plummeted in April and May, Parnham said."As we've come back into June, people started to purchase a little bit more but... when I look at our numbers people are topping up, they're not filling up."