It finally happened, after eight weeks of decreases gas prices have gone back up, by a penny in the last two weeks. The latest Lundberg Survey says the average price is $3.54/gallon for regular. Diesel is still headed down, a nickel in the past two weeks to $3.93. Chicago leads the nation for the top price $4.28, Baton Rouge LA has the lowest at $3.20. Here in Missoula the prices vary from $3.22 to $3.29.