Trump diesel export ban could raise U.S. gasoline prices

Morgan Stanley analysts warned that a proposal by former President Donald Trump to ban diesel exports could tighten U.S. gasoline markets and raise retail pump prices. The bank said limits on distillate shipments would change refinery incentives and product balances in ways that could tighten gasoline supplies.

In a research note, Morgan Stanley explained that limiting diesel exports would reduce overseas demand for U.S. distillates, leaving more diesel available domestically and changing the relative economics between diesel and gasoline. Refineries produce diesel and gasoline in linked proportions, so a sudden change in demand for one product can force refiners to change crude slates, cut run rates or reconfigure operations, with effects on gasoline output and wholesale prices.

Analysts said refiners set throughput and crude selection based on margins for finished fuels. If diesel becomes harder to sell overseas or a domestic oversupply lowers diesel prices, refiners may alter production choices in ways that reduce gasoline yields or raise processing costs. Those adjustments could shrink available gasoline volumes or increase wholesale gasoline margins, which normally feed through to higher pump prices.

Morgan Stanley noted the size and duration of any ban would shape the scale of the impact. Short, targeted restrictions would give refiners time to adapt and could limit price movement, while a long-lasting or broad prohibition would likely produce larger and more persistent effects on refinery economics and fuel markets. The speed with which refiners can change equipment and crude inputs is a key variable.

U.S. refiners have become major exporters of diesel and other distillates in recent years, sending large volumes to buyers in Latin America, Europe and elsewhere. Removing that export outlet would force trade flows to shift, potentially sending buyers to alternative suppliers and altering regional and global price relationships for refined products. Morgan Stanley said those shifts could tighten gasoline availability in the United States even as domestic diesel stocks rise.

The proposal to restrict diesel exports surfaced during the presidential campaign and is part of broader energy and trade discussions. Supporters of export limits have framed the idea as a way to protect domestic fuel supplies and lower pump prices.

Higher gasoline prices would affect consumers and measures of inflation that include energy costs. The extent of retail price changes would depend on how quickly wholesale markets reacted, the responsiveness of refiners’ runs and any offsetting shifts in imports or inventories.

The U.S. lifted a long-standing crude oil export ban in 2015, and refined-product flows have since become an integral part of global fuel markets. Morgan Stanley wrote, ‘Limiting diesel exports would reduce the overseas demand outlet for U.S. distillates,’ and added that the net effect on gasoline would depend on which products were restricted, how long restrictions lasted, whether exemptions applied, and how fast markets adjusted. Analysts urged policymakers and market participants to consider the linked nature of refinery output and traded fuel markets when evaluating proposals to curtail exports.