IRVING, Texas (CBSDFW.COM/AP) – Retail gasoline prices across Texas increased by a penny this week, but many commuters across the metroplex have seen much larger increases.

AAA Texas said Thursday the statewide average is 6 cents more than this time last year, currently at $3.46 a gallon. The national average stands at $3.65.

Many stations in Dallas-Fort Worth are now charging $3.59 for regular unleaded, a jump of 10 to 15 cents since Tuesday. Senior Petroleum Analyst Patrick DeHaan says a small tornado hit the nation’s third-largest refinery early Wednesday in Louisiana, which has pushed prices up.

The damage is still being assessed at the Marathon Oil plant in Garyville, Louisiana. DeHaan says it could take 2-3 weeks to boost production back to full capacity. In the meantime, he adds local gas prices could climb another 5 to 10 cents per gallon.

AAA says geopolitical tensions, most notably in Ukraine, are pushing global oil costs upward, which are in turn driving up retail gas prices.

But Texas is among the top 10 states that on average have the least expensive gas in the country this year.

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