The Gasoline Price Question

It happens every year about this time, with the coming of warmer temperatures is the usual increase in gasoline prices.  The standard answer for the spring spikes is the re-formulation to a "summer blend" and increased demand by motorists who start driving more.  According to the website minnesotagasprices.com, the average in Minnesota for a gallon of unleaded regular is 2.72, which compares favorably to the national average of 2.73.  Here in the Twin Ports, its an entirely different story.  Most stations in Duluth were charging 2.85 a gallon on Monday while it was 2.89 in Superior.  Nobody seems to know why it is 13 cents a gallon cheaper just a few miles down I-35 in Minnesota.  Superior prices are normally a few cents above Duluth's because of higher Wisconsin gas taxes.  The average price is also about 80 cents a gallon more than it was a year ago at this time.  Just like the old saying about the weather...you can complain about it but there's not much you can do about it.  Except, lately, there haven't been many complaints about the warmer than normal weather.