US gasoline hits $4.31, diesel record as Iran war drives 40-60% fuel price surge

US national average gasoline price has risen 40% and diesel 60% since the US-Iran war began in late February, with gasoline now at $4.31 and diesel at a record high. The surge reflects oil supply disruption from the conflict, though the exact magnitude of further price pressure depends on war duration and supply responses. This marks a significant energy price shock with direct inflationary and consumer impact.