Leslie Mazoch, Associated Press
Oil rigs drill in Venezuela's oil-rich Zulia state Nov. 30, 2006. The average price of a gallon of regular gas fell to $4.105.

NEW YORK — The price of oil recorded its biggest weekly drop ever, and a gallon of gas finally pulled back from its record high. So is it time to declare the energy bubble popped?

Experts won't go that far just yet.

"It's too early to say we've seen the worst of it," said Tom Kloza, publisher and chief oil analyst of the Oil Price Information Service in Wall, N.J. "We would be Pollyannish if we believe one week represents a trend."

Still, with oil recording yet another drop on Friday, some industry experts who just days ago thought there was more juice left in oil's meteoric run are reconsidering.

"If this is not the bubble's implosion, than it's a reasonable facsimile," analyst and trader Stephen Schork said in his daily market commentary. "Time will tell. Nevertheless, for the time being, we no longer care to hold a bullish view."

Light, sweet crude for August delivery fell 41 cents Friday to settle at $128.88 on the New York Mercantile Exchange — well below its trading record of more than $147 a week earlier.

The average price of a gallon of regular gas fell about a penny for the day, to $4.105, according to auto club AAA, the Oil Price Information Service and Wright Express. Diesel prices dipped three-tenths of a cent to $4.842 a gallon.

In Utah, however, average gas prices Thursday were at a record high: $4.22 for a gallon of regular unleaded. Diesel in Utah was at $4.79 per gallon.

Some analysts said a nationwide average of $4 or even lower could be in the offing — almost unthinkable in a summer when there has seemed to be no relief at the pump — although they cautioned that there is no guarantee prices will stay low.

"We're going to see some relief from that relentless march higher," Kloza said.

Gas nationally may be getting just a bit cheaper, but major changes in how Americans live and drive are already in motion.

Car buyers have been fleeing to more fuel-efficient models. U.S. sales of pickups and sport utility vehicles are down nearly 18 percent this year through June, while sales of small cars are up more than 10 percent.

While slashing production of more-profitable trucks and SUVs, automakers have been scurrying to build their most fuel-efficient models faster.

Toyota Motor Corp., which hasn't been able to keep up with demand for its 46-miles-per-gallon Prius hybrid, said last week that it will start producing the Prius in the United States and suspend truck and SUV production to meet changing consumer demands.

Ford Motor Co. and General Motors Corp. also have announced plans to increase small car production, and GM has said 18 of the 19 vehicles it is launching between now and 2010 are cars or crossovers.