There's been a price hike at the pump in the Midwest... filling up your tank is taking a bigger toll on your wallet.

FOX News Radio's Jennifer Keiper reports from Chicago:

You pull up to the pump, and, like this Minneapolis area driver, you notice the prices.

(Driver) "It's very frustrating."

Gail Weinholzer with AAA in Minnesota says maintenance has shutdown two big oil refineries that supply the upper Midwest and... 

(Weinholzer) "We will not see any significant decline before the middle of June  We may not see any significant decline before the 4th of July."

Same story for states like Iowa where AAA says the average price is $3.87 and rising. Or Minnesota close to $4.20. shows a station here with a posted price of $4.79 for a gallon of Regular Unleaded.

In Chicago, Jennifer Keiper, FOX News Radio.