LANSING, Mich. (AP) -- The worst may be over for drivers in the upper Midwest who have been grappling with the highest gasoline prices in the continental U.S.
Analysts said one major Illinois refinery is back online and another big one in Indiana is on track to ramp up production again soon. The refineries' ongoing maintenance -- which led to reduced supply and higher prices -- are the primary culprits for the surge at the pump.
"On balance, I think the worst is over," Tom Kloza, chief oil analyst at GasBuddy.com, said Tuesday.
Exxon Mobil's refinery in Joliet, Ill., was offline longer than expected, he said. Assuming there are no hiccups with BP's plans to soon restart a crude unit at its refinery in Whiting, Ind., prices could drop below $4 a gallon within weeks throughout a five-state region stretching from Wisconsin to Ohio, according to experts.
"You just have one refinery issue after another. As they're coming back on, that should be a big thing," said Phil Flynn, chief energy analyst at Price Futures Group in Chicago.
AAA said Michigan's average price of a gallon of unleaded regular gas was $4.20 on Tuesday, topped only by Hawaii and well above the national average of $3.63 per gallon. Motorists in Illinois, Indiana and Wisconsin were paying above $4 on average while drivers in Ohio were shelling out $3.90.
Gas prices in the five Midwest states ranked in the top nine states nationally.
With many people preparing to hit the road for their summer vacations, public anger over the high price of gas is building in Michigan. One Republican lawmaker is drafting a bill designed to entice construction of a new refinery in the state and Democrats are questioning the state attorney general's commitment to investigating high prices.
Anton Fellinger, who lives near Detroit in Macomb County's Washington Township, finds the high pump prices particularly acute with his 2008 Chevrolet Silverado.
"My blood boils every time I put gas in it," he said. "I'm biting the bullet right now, but if this continues I might pull the trigger and get something that gets me 30 miles per gallon."
Fellinger, who drives about 18 miles to work, found a more economical mode of transport on Tuesday: his motorcycle. But that option is limited in northern states such as Michigan. His saving grace on days he drives the Silverado is a local gas station that offers free car washes for customers who buy at least eight gallons of gas.
"I've just been racking up the free car washes," he said. "I might as well get something out of it."
Analysts said it will take some time for the refineries to ramp up production, but the upgrades -- which took longer than expected at the Illinois refinery -- ultimately could pay dividends because some maintenance is being done so facilities like the one in Whiting can refine Canadian crude oil.
"This is the busiest (refinery) reconfiguring quarter we've seen in a generation," Kloza said. "A year from now you should be beneficiaries of all the cheap crude coming from Canada. It's a little pain this year but perhaps it means gain next year."
Continuing of a time-honored tradition of politicians from either major party seizing on gas prices whenever they spike, Democrats in the Michigan House on Tuesday said the public deserves answers.
House Minority Leader Tim Greimel of Auburn Hills said he does not believe most gas station owners are taking advantage of the refinery issue to gouge drivers. But in calling on the Michigan's attorney general to investigate, he questioned if there is broader price manipulation higher up in the supply chain.
"It's time the state government stood up and tried to protect Michigan families in every way possible," Greimel said.
Attorney General Bill Schuette, a Republican, said a myriad of factors contribute to fluctuating gas prices. He warned retailers against taking advantage of customers while at the same time saying his office routinely investigates the issue and will not hesitate to act if laws are broken.
Mary Jo Godard, a home health care worker, said fuel costs are taking a "big chunk" out of her paycheck. Godard said she was spending between $250 and $300 a month on gas, and figures that has increased in recent weeks. She said high gas costs and long work hours conspire to keep her from doing much in her off hours.
"I don't have time -- and I really can't afford it," said Godard, who lives in Sterling Heights in suburban Detroit. "Thank God I don't have a house payment. How do people do it?"
Associated Press writer Jeff Karoub in Detroit contributed to this story.
Email David Eggert at deggert(at)ap.org and follow him at http://twitter.com/DavidEggert00