Oil prices tumble in biggest weekly drop ever

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.

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