US Refiners Argue Biofuel Mandates Are Driving Diesel to Four-Year Highs
Refining executives told Trump at a White House meeting that blending quotas compound supply costs already pushing diesel to levels not seen since 2022.
ICE Brent crude front-month pulled back to $96.28 per barrel on 2026-09-07 after four consecutive sessions above $97, while NYMEX heating oil front-month — the U.S. distillate benchmark — held at $4.61 per gallon in the same session. Those levels follow a national diesel average of $5.78 per gallon recorded on 2026-09-03, its highest since 2022, according to finance.yahoo.com.7
The price surge arrived days after President Trump convened oil refining executives at the White House on 2026-09-01 and pressed them to boost domestic output. The meeting ran roughly an hour. The pushback, according to people familiar with the conversation who spoke on condition of anonymity, was direct: federal biofuel-blending requirements under the Renewable Fuel Standard were lifting costs at the pump, executives argued.6,8
Compliance credits known as renewable identification numbers, or RINs, doubled in value in the first half of 2026, driven by higher blending targets, the EIA reported on 2026-06-10. The EPA puts the annual cost of the current mandate at a minimum of $20 billion. Nearly three dozen conservative House members cited that figure in a letter dated 2026-06-25, calling the quotas the single most expensive regulation of Trump's second term.3,4
Trump's position is awkward on its face. His administration set the blending targets now under attack from within his own party. Corn and soy producers who benefit from mandated ethanol and biodiesel demand are central to the Republican coalition in farm states. Scaling back the RFS would reward refiners while opening a rift with agricultural allies before November 2026.4,1
The broader supply picture offers no easy offset. EIA data show gasoline stocks running 5 percent below the five-year seasonal average, with diesel and jet fuel 3 percent under that mark. Commercial crude inventories fell by 8 million barrels during the week of 2026-05-25, the eighth consecutive weekly draw, leaving stocks 3 percent below the five-year average, the EIA reported on 2026-06-03. The Strategic Petroleum Reserve is near the low it reached in July 2023, after the Biden administration drew it down following Russia's invasion of Ukraine.2
ING commodities analysts estimate Persian Gulf oil exports are running at roughly 50 percent of pre-war levels, providing a floor under global crude prices. That supply constraint has no short-term fix on the demand side either.7
Refiners' argument that they can simply produce more runs into physical limits. Meaningful capacity additions would take months to years to deliver measurable volume, oilprice.com reported on 2026-09-03. With policy uncertainty spanning biofuel mandates and the possibility of export restrictions, companies have little incentive to commit capital to new refinery construction, oilprice.com noted.8
The export question adds a further complication. Distillate shipments hit record levels earlier in 2026 and gasoline exports were running between 750,000 and 1 million barrels per day, according to oilprice.com in August 2026. The administration weighed an export ban during the week of 2026-08-03 but stopped short of formal action. No restriction has been announced since.5
Biofuel volumes are expanding regardless of the political argument around the mandate. EIA forecasts show renewable diesel production rising 24 percent in 2026 versus 2025, biodiesel climbing 41 percent, and fuel ethanol's share of motor gasoline consumption projected at 10.7 percent this year against 10.5 percent in 2025. Those volumes add supply to the pool but carry compliance costs that refiners are now billing back, publicly, against the administration that mandated them.3
Any executive action on the RFS — a small-refinery exemption, a blending requirement reduction, or a targeted waiver — would move RIN prices immediately and ease margin pressure on independent refiners. RINs had already doubled from the start of 2026 through early June, per EIA data. Compliance credit desks are now watching whether the White House redirects pressure toward export volumes instead, or moves directly on the mandate before November 2026.6,4,3