The Midwest has a firm supply of oil from western Canada and excess refinery capacity but lacks the infrastructure to move gasoline and diesel to East and West Coast markets, where refining capacity has declined due to retirements, conversions, and closures. In the latest video from the Institute for Energy Research we explain how expanding pipeline infrastructure will allow Midwest refiners to bring down gas prices across the country.
More research on gas prices from IER:

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When gasoline prices climb, drivers everywhere start asking the same question: what’s really behind the pain at the pump? Get the full story from IER's latest report on gas prices.
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