Record-high gas prices this winter have put increasing pressure on household budgets during a time when trips to the gas station are typically cheaper.

But it’s not just budget-strapped consumers lamenting unseasonably expensive fuel—lawmakers too are pressing for a closer look at what’s causing surging prices at the pump.

On Monday Senate Energy and Natural Resources Committee Chairman Ron Wyden (D-Ore.) sent a letter to the Energy Information Administration, asking for more information about domestic oil production, exports and imports, refining operations, and any other factors that could be contributing to the uptick in gas prices.

“American families and businesses have been paying record-high gasoline prices at the pump even as domestic oil production recently hit its highest level in more than two decades,” Wyden wrote EIA Director Adam Sieminski. “For many Americans, there appears to be a fundamental disconnect between these facts, especially when many families are also using less gasoline thanks to more efficient cars and trucks.”

Wyden—who recently said spikes in fuel costs have “no reasonable explanation”—requested the information ahead of an anticipated committee hearing to address the causes for high fuel prices, even while domestic oil production has surged.

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