Wichita drivers started the work week paying more at the gas pump. Prices in the metro jumped 10 cents overnight to $3.19.

Some stations across the city were selling a gallon of regular unleaded as high as $3.25.

AAA tells Fact Finder 12 the hike is due to refineries switching over to summer blend gasoline. The product is more expensive to producer, and slows down production during the switch over.

Jim Hanni, AAA spokesman, said the change is a couple of weeks earlier than normal. Prices could creep even higher through the next month. But Hanni said drivers shouldn't be paying more at the pump this year compared to last year.