BRIDGEPORT, Calif.—When Miguel Lujan needs gasoline for his truck, he gets it in Carson City, Nev., located 80 miles from his hometown. It’s worth it, the store clerk and roller-derby player says, to pay one-third less than the local average of nearly $6 a gallon.

California currently has the highest gas prices in the nation, an average of $4.70 a gallon of regular unleaded, according to AAA. Gasoline prices in the U.S. were up 50% in October from the same month last year, amid rising inflation.

The...

BRIDGEPORT, Calif.—When Miguel Lujan needs gasoline for his truck, he gets it in Carson City, Nev., located 80 miles from his hometown. It’s worth it, the store clerk and roller-derby player says, to pay one-third less than the local average of nearly $6 a gallon.

California currently has the highest gas prices in the nation, an average of $4.70 a gallon of regular unleaded, according to AAA. Gasoline prices in the U.S. were up 50% in October from the same month last year, amid rising inflation.

The most expensive gas in California is here in Mono County, a 13,000-person tourist destination on the border with Nevada that is home to the Mammoth Mountain ski resort. The average price for a gallon of regular unleaded is $5.66, according to AAA.

In Bridgeport, a town of about 550 that serves as the county seat, the two gas stations were selling regular unleaded for $5.95 and $5.99 a gallon last week. In the nearby town of Lee Vining, which serves as a gateway to Yosemite National Park, a gallon of regular cost $6.09.

Miguel Lujan, a professional roller-derby player and Bridgeport General Store clerk, says he tries to avoid buying gas in town and drives to get it out of state.

Photo: Alicia A. Caldwell/The Wall Street Journal

Mr. Lujan said he makes the trip to Carson City about three times a week and sometimes takes the bus to save on gas. He fills canisters, routinely keeping about 100 gallons stored in his house.

He started buying gas out of state soon after moving to Mono County four years ago. “The first year I was here, I spent more on gas than anything else,” he said.

President Biden on Wednesday called on the Federal Trade Commission to investigate whether oil-and-gas companies are illegally keeping prices high. Outside analysts were skeptical whether the FTC will find sufficient evidence to substantiate those claims.

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California has long had the highest gasoline prices in America. It has the highest tax, at nearly 67 cents a gallon, and only a few aging refineries, which sometimes go offline because of maintenance or other issues, are capable of producing gasoline that meets the state’s standards meant to reduce air pollution.

Though $5.66 represents a new high, inflated gas prices are nothing new in Mono County. Local residents and analysts attribute that to a variety of factors including its distance from population centers from which deliveries including gasoline come. Sacramento, the closest major city, is about 200 miles northeast.

Even with the high prices, gas stations are able to operate primarily because of tourists who buy gas on their way through, according to Linda Smith, a clerk at the Lee Vining Chevron station.

“They come in and complain,” Ms. Smith said of customers unhappy with the station’s prices. The most common reason she gives, she said, is that it is difficult to operate a business in a remote area that relies on seasonal tourists.

“We’re a pass-through town,” she said.

In Bridgeport, Calif., a gallon of regular unleaded gasoline cost $5.95 a gallon at one station last week and $5.99 at another.

Photo: Alicia A. Caldwell/The Wall Street Journal

Station owners in Lee Vining and Bridgeport didn’t respond to requests for comment. Owners of gas-station franchises typically set their own prices based on factors such as wholesale costs, expenses and competition.

Some people stop at the stations in Mono County simply to gawk at the prices.

Tony Malais pulled over at the Lee Vining station Tuesday afternoon on his way back to Boise, Idaho, from Southern California. He had filled his Cadillac sedan in Northridge, outside Los Angeles, for $3.79 a gallon and hoped to make it to Nevada before needing to fill up again.

He had already stopped to take a photo of the station’s price sign on his way into California. This time he bought a soda. “I had heard it was about $5 a gallon. But I was surprised to see it over $6,” he said.

Pam Mowat, a real-estate agent who also runs a vacation and rental property business in Mono County, stopped by the Chevron on Wednesday. She said sky-high prices at the few area gas stations was a fact of life that local residents had gotten used to.

“I live here, I don’t have a choice,” said Ms. Mowat, who spent about $55 for roughly nine gallons of regular. She said she was headed to Reno later in the day, and would fill her Subaru Forester there, where AAA reported an average price of $4.20 a gallon for regular.

Rose Lierly, who runs a brewery in Bridgeport, Calif., with her husband, says she routinely fills up her car during shopping trips about an hour away in Nevada.

Photo: Alicia A. Caldwell/The Wall Street Journal

Rose Lierly said it isn’t just gas prices that are high in Bridgeport. Costs for nearly all supplies for Big Meadow Brewing Co., a small brewery she runs with her husband, have been on the rise in recent months.

“I used to buy [cases] of bottled water, 48 for $5.25. Now I get 32 for $5.25,” Ms. Lierly said. “It’s just because we are so remote here and freight charges are going up.”

Like others in town, Ms. Lierly said she doesn’t tend to buy gas in Bridgeport, instead filling up during shopping trips to Gardnerville, Nev., a 130-mile round trip. With premium fuel about $2-a-gallon cheaper there, she said, it is worth the drive. But she said she doesn’t begrudge the local gas-station owner for charging more.

“We get hit with inflation, and we take a hit every which way,” she said.

Write to Alicia A. Caldwell at Alicia.Caldwell@wsj.com