Motorists are filling their tanks with gasoline that's cheaper than just a month ago, a trend that's likely to continue for the rest of the summer.

The national average for a gallon of unleaded regular gasoline was $2.722 today, according to AAA, Wright Express and Oil Price Information Service. That's about 0.7 cent less than it was a month ago but around 25 cents higher than a year ago.

The highest pump prices are in the West, where they average from $2.847 a gallon to $3.499. Travelers across Texas and much of the Midwest are seeing some of the lowest prices, averaging from $2.468 a gallon to $2.577 a gallon.

Gasoline demand has been fairly weak for the typically busy summer season, as Americans hold on to their cash in the uncertain economy. Oil and gas supplies remain ample, which should translate into declining pump prices, said PFGBest analyst Phil Flynn.