The average for a gallon of regular no-lead remained at $2.70 overnight in the five-county Philadelphia area, according to AAA Mid-Atlantic.

South Jersey's average was up 1 cent overnight, to $2.48.

The national average was $2.61, up 1 cent overnight.

Philadelphia area's diesel average was at $3.01, up 1 cent. South Jersey's was unchanged overnight, at $2.68.

The national diesel average remained at $2.79.

Meanwhile, energy prices flattened with the majority of futures traders taking the holiday week off, though a weak dollar and falling supplies helped keep a barrel of oil around $79 per barrel.

Benchmark crude for February delivery gave up 18 cents to $78.59 a barrel on the New York Mercantile Exchange. In London, Brent crude for February delivery added 12 cents to $77.44 a barrel on the ICE Futures exchange.

Crude prices have pressed higher for four straight days and are not too far below the high for the year of $82 a barrel, and that's tugging other fuels higher as well.

In other Nymex trading in January contracts, heating oil rose 2.49 cents to $2.0984 gallon while gasoline ticked higher by less than a penny to $2.0192 a gallon. Natural gas fell 5.7 cents to $5.933 per 1,000 cubic feet.