Gas prices are retreating from their high-water mark for 2015 as oil production increases.

With the price of crude oil remaining low, gasoline prices began to retreat this week after a spike blamed on production issues drove prices to their highest levels this year.

The average price of gasoline across the United Stated moved to a new high of $2.80 per gallon on average last week, but the national average price for regular unleaded gasoline has eased back to $2.79 per gallon, according to AAA’s weekly survey of pump prices.

AAA reported the current price is 5 cents higher than one month ago and remains significantly discounted from this time last year with drivers saving an average of 89 cents per gallon year-over-year.

Retail averages were relatively stable week-over-week, moving up or down by a modest 3 cents per gallon in 40 states and Washington, D.C. Motorists in 21 states are experiencing weekly savings at the pump, with the largest savings in the Midwest as the price of gasoline dropped by 15 cents in Indiana, by 10 cents per gallon in Ohio and by 9 cents per gallon in Michigan, largely due to refineries coming back online following production issues.

For example, ExxonMobil’s refinery in Joliet, Illinois, and PBF Energy’s refinery in Toledo, Ohio, are reportedly operating at normal rates following recent malfunctions, which should further support the region’s gasoline supplies, AAA said.

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On the other end of the spectrum, averages in 29 states and Washington D.C. climbed higher during the same period, although in a less dramatic fashion. The price is up by more than a nickel per gallon in Washington, Oregon, Alaska and Delaware, AAA reported.

At $3.40 cents per gallon, drivers in California are paying the nation’s highest averages for retail gasoline, though prices have dropped significantly as refineries increase production and the supply situation in the region improves. In all, a total of seven states are posting averages above $3 per gallon. Consumers in South Carolina are paying the lowest price at the pump, and are saving more than $1 per gallon compared to California.

Crude oil prices moved lower late last week due to a stronger U.S. dollar amid concerns about Greece’s financial instability. Eurozone leaders are continuing to negotiate in hopes of preventing a Greek default.

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A default or Greece’s exit from the Euro group could impact financial markets and could reduce global energy demand. The Organization of the Petroleum Exporting Countries reported its largest production levels since October 2012, and the U.S. also continues to produce at record levels.

The global market is likely to remain oversupplied in the near term and any reductions in demand are expected to put downward pressure on price and exacerbate the current dynamic of oversupply, analysts have said as the price of oil futures settled at $59.61 per barrel at the end of last week.

Even though regional refinery issues have driven the recent increase in the national average for retail gasoline, the cost of crude oil remains the underlying factor in the price motorists pay at the pump.

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Market analysts continue to suggest that ample crude oil supply will outpace global demand and characterize oil markets in the near term. Saudi Arabia, the world’s leading crude exporter, is reportedly prepared to increase its production to meet strong demand, which likely would keep a ceiling on the price of crude. Domestic production also remains elevated and is expected to remain at or near current levels, despite the reduction in U.S. oil rig counts.