(NYT) — The oil that leaked from a pipeline beneath a warehouse complex in suburban Romeoville for four days was equivalent to only several hours worth of what leaked from the BP gusher in the Gulf of Mexico.

Although the 250,000-gallon spill in Illinois that started on Sept. 10 was relatively small, it had an immediate effect on fuel prices, industry experts said, unlike the BP disaster. Spikes in the wholesale market and at the gasoline pump underscored the importance and vulnerability of the network of pipelines that — unknown to many residents — lie under the Chicago area.

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