Nearly seven months into the U.S. war against Iran, several economic pressure points have been breached, including oil above $100 a barrel, gasoline nearing $5 a gallon and diesel topping $6 per gallon. The Pentagon has told Congress the war’s cost has climbed to $42 billion, above the Congressional Budget Office’s $38 billion estimate. Economists say the outlook is increasingly uncertain and that an exit strategy is not becoming clearer.