LONDON (Reuters) -- Swelling gasoline stocks and a far-bigger-than-expected rise in U.S. unemployment drove oil markets down more than $2 Thursday to below $67 a barrel.

In the latest signal the economy of the world's biggest energy consumer was still struggling, data Thursday showed U.S. employers had cut 467,000 jobs in June and the unemployment rate had risen to 9.5%.

U.S. crude settled down $2.58 to $66.73 a barrel. The contract settled 58 cents lower at $69.31 Wednesday.

"It shows an economy still in distress that can only be echoed in earnings reports after the holidays," said Mike Fitzpatrick, vice president at MF Global in New York.

In addition, analysts cited Wednesday's U.S. government inventory data that showed gasoline stockpiles in the United States rose by 2.3 million barrels last week.

Distillates, including diesel, also rose by 2.9 million barrels, although crude stocks dropped by 3.7 million barrels.

Traders viewed the increase in motor fuel ahead of the U.S. July 4 Independence Day holiday -- which traditionally marks the peak of the U.S. summer driving season -- as a symptom of continued demand weakness.

Some analysts are still relatively bullish, however, and say the Organization of the Petroleum Exporting Countries has been very successful in stabilizing the market.

Oil has rallied from a low of $32.40 in December last year to highs above $70 a barrel in June, although it is only around half last July's record of more than $147.

Over the second quarter of this year it gained around 40% -- the strongest quarterly gain since 1990.

"Everybody has been surprised at the effectiveness of the OPEC cuts," said Angus McPhail of British-based investment firm Alliance Trust.

"We're in a normalized range somewhere between $60 and $80 in the current environment, excluding the Iranians kicking off ... Nigeria etc ... I think that's what we're looking at and it's what OPEC's looking at too."

Political unrest in oil producer Iran has had little impact on prices because the oil market is well supplied and there is no expectation of Iran cutting off supplies.

Militant unrest in OPEC member Nigeria has had a bigger impact. It has forced the shut-in of an estimated 600,000 to 700,000 barrels per day (bpd).

The involuntary output reduction has improved OPEC's compliance with production curbs, although discipline has retreated from a peak of around 80% earlier this year.

Reuters' latest OPEC survey assessed compliance at around 72% of promised cutbacks totaling 4.2 million bpd since September.

As output creeps higher, one of OPEC's smallest crude exporters Qatar told at least two Asian term buyers it will supply its Marine crude at full contracted volumes for August, compared with 14% supply curbs for July, sources at the firms said Thursday.

While the West has taken the brunt of the economic downturn, analysts have been looking to Asia to keep generating fuel demand.

But the governments of China and India this week both unexpectedly raised gasoline and diesel prices by as much as 10%, potentially capping demand growth.