1.   Analysts and traders said rates that high often lead to refinery problems, which could reduce production and send prices higher.

2.   A rash of refinery problems also could put a crimp in the supply pipeline.

3.   Additionally, refinery problems that held up production are starting to be corrected.

4.   Concern is growing that a recent spate of refinery problems could drain inventories at a time of peak demand from vacationing motorists.

5.   Concern is growing that a recent spate of refinery problems could drain inventories at a time of steady demand from vacationing motorists.

6.   Experts blame the increase on refinery problems in Northern California and a vow by oil-producing countries to reduce their output of crude oil.

7.   Exxon declined to comment, and some traders said the company denied having any refinery problems.

8.   Gasoline jumped on expectations that a spate of refinery problems and strong demand from vacationing motorists pulled inventories lower.

9.   Gasoline prices rose for the fifth straight day amid concern a series refinery problems has lowered gasoline production.

10.   Gasoline rose after an industry report showed a larger-than-expected drop in inventories last week, as refinery problems curbed supply.