New Delhi, March 8 -- The longer the war in Iran lasts, the higher gas prices will rise back in the U.S. For drivers, that leaves the question of just how much pain they'll feel at the pump-and when.

Several industry experts have already placed their bets, with estimates ranging from $5 to $5.50 if the price of Brent crude oil, the international benchmark, hits $150 a barrel. For gas, that's an increase of around 50% from the current national average of $3.36, according to Gas Buddy.

While $150 oil may sound like a wild assumption-now it's just north of $90 a barrel-that price was even floated by Qatar's energy minister, Saad El-Kaabi, after an Iranian drone strike on Monday forced the oil-rich Gulf nation to shutter its largest liquefi...