Average gasoline prices in Minnesota have fallen 2.8 cents per gallon in the last week, averaging $2.92. The national average price of gasoline has remained unchanged over the last week, averaging $3.03. The national average price of diesel has increased 0.8 cents compared to a week ago and stands at $3.77 per gallon. Gas Buddy says many states could begin to see declines in gas prices in the weeks ahead, just in time for the holidays.