In a welcome reversal of recent news, gasoline prices posted a decline on Monday, July 28 for the eleventh day in a row, retreating to levels last seen in May.

According to figures compiled by AAA, the average per gallon price of gasoline stands at $3.958 while Lundberg Survey, Inc. places it at $3.9959 with data gathered on July 25.

Gasoline exceeded the $4 per gallon level on June 7 and climbed to $4.114 on July 16, holding steady for two days before a double-digit dip in the price of oil led investors to pull back, concerned that the global demand for oil was retreating.

The most expensive gasoline is still for sale in Alaska at $4.643 followed by Hawaii at $4.479 and California at $4.316. The least expensive gasoline can be found in Oklahoma at $3.686 followed by Minnesota at $3.714 and Ohio at $3.73.

The cost of diesel, which has strained the trucking industry and driven the price of consumer goods up across the board is still 60 percent more expensive than last year and stands at $4.736 according to the latest figures. The most expensive diesel, in Hawaii, is selling for $5.372 while the least expensive in Oklahoma is at $4.51.

The extended period of high prices has led many consumers to switch to E85 ethanol, a cleaner burning fuel than gasoline made primarily from corn and currently selling at $3.222 per gallon on average. Unfortunately, ethanol is not as efficient as gasoline making the equivalent price per gallon in mileage to gasoline $4.24.