| 1 | An oil refinery in Canada. | |
| 2 | The oil is carried to the oil refinery by pipelines. | |
| 3 | In 2007 a refinery in Indiana received a permit to increase discharges into Lake Michigan. | |
| 4 | But that's not the only reason for gasoline prices lagging behind. Refinery operators may be taking a cut for as long as they can. | |
| 5 | Officials said the blaze, caused by a leaking oil pipe from the refinery, gutted about 100 homes in two hours. |
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