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ANCHORAGE - Gov. Sarah Palin and two state senators are asking for an investigation into why Alaska's gasoline prices are so much steeper than anywhere else in the nation.

They asked Attorney General Talis Colberg to look into why Alaskans are paying about 75 cents a gallon more than the national average even though the state has one of the lowest gasoline taxes in the nation.

In a letter to Talis on Monday, Anchorage Democratic Sens. Bill Wielchowski and Bettye Davis said they want to know if Alaskans are being gouged.

The letter said the gap between Alaska prices and national prices a year ago was just 13 cents a gallon.