TRENTON, N.J. (CBS/AP) — Motorists are seeing slightly lower prices at the pumps in Pennsylvania and New Jersey.

AAA Mid-Atlantic says the average price of a gallon of regular gas in the Keystone State on Friday was $2.56. That’s down a penny from last week.

Motorists were paying $2.22 for gas at this time last year.

Across the river in New Jersey, the average price for a gallon of regular gas was $2.42. That’s also down one cent from last week.

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Drivers in the Garden State were paying $1.91 for gas at this time last year. A 23-cents-per-gallon gas tax increase went into effect November 1.

The price drop ends a four-week stretch where gas prices had risen in New Jersey.

The national average gas price on Friday was $2.36, up 2 cents from last week. That’s also higher than the national average from a year ago, when motorists were paying $2.13.

AAA says gas inventories have risen in recent days, even though crude oil inventories have fallen.

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