Angie Howard lives in a walkable neighborhood in Portland, Ore., and works from home, so she has not had to shell out for higher gas prices since the war in the Middle East began. Still, Ms. Howard, who lives alone, said she had noticed costs jumping all around her anyway. “You go into the grocery store, you buy the things you normally would, and then all of a sudden it’s $20 or $30 more there, and you start to see additional fuel charges,” she said. “And at the end of the week, where you would normally have two nickels to rub together, now they’re not there.”