In less than a month, gas prices have climbed more than $1 per gallon in suburban Atlanta, where Joshua Elliott delivers meals every morning for DoorDash before clocking in at his full-time job. The higher fuel costs have added about $15 a week to his driving expenses, nearly equal to an hour’s take-home pay from food delivery.

“It’s not life-changing, but it’s probably about an extra hour or hour and a half of working,” said the 33-year-old, who’s trying to save up for an engagement ring for his girlfriend. “That’s time I was going to relax. Now I’ve got to go out and work instead. I feel the grind more.”

Gasoline prices have shot up about 30% nationally in the three weeks since the U.S. and Israel launched surprise attacks on Iran. The cost of crude oil, which largely determines what drivers pay at the pump, has soared above $100 per barrel as Iran throttles the vital shipping corridor known as the Strait of Hormuz. Israel’s attacks on Iranian oil and gas fields Wednesday increased the possibility of long-term disruptions to fuel production.

President Donald Trump hasn’t indicated when the war might end, or even what would constitute a U.S. victory. In the meantime, what Elliott has witnessed in Georgia — a jump from roughly $2.71 to $3.77 per gallon, according to AAA — is comparable to the average fuel cost increase for the country as a whole. It makes for the second-largest one-month gas price increase in three decades, behind only the supply shock created by Hurricane Katrina in 2005.