The average price of unleaded gasoline increased 2 cents to $2.31 from a week ago and now sits four cents higher than a month ago and 50 cents above a year ago with U.S. and Middle East oil production poised in a counter-balance.

Retail prices continue to fluctuate with U.S. production increasing and OPEC capping output, according to AAA.

New England gasoline prices saw the sharpest decline (1.4 cents to $2.258) on the week, while Midwest prices increased to most (5.7 cents to $2.267), according to the U.S. Energy Information Administration.

The nation’s top five most expensive markets include Hawaii ($3.08), California ($2.99), Washington ($2.79), Alaska ($2.77) and Nevada ($2.61).

The nation’s top least expensive markets include South Carolina ($2.05), Tennessee ($2.07), Alabama ($2.07), Mississippi ($2.09) and Arkansas ($2.11).

The nation’s most dramatic weekly price increases include Michigan (12 cents), Indiana (11 cents), Ohio (9 cents), Illinois (7 cents), and Kentucky (6 cents).

Meanwhile, the average price of diesel increased two-tenths of a cent to $2.579. Diesel remains 55.8 cents higher than a year ago.