Why Is Diesel More Expensive Than Gasoline Right Now?

Kevin J.S. Duska Jr. • SIGNAL CAGE / PRIME ROGUE INC. • FILED: AUG 24, 2026 • READ TIME: ~3 MIN

The Short Answer

Diesel is more expensive than gasoline right now because global refining capacity — not crude oil supply — is the bottleneck, and refiners are converting crude into diesel at the lowest rate relative to demand in decades.

Crude oil prices have stayed relatively contained through 2026. Diesel prices have not. The gap between what refiners pay for crude and what they charge for finished diesel — called the crack spread — hit a record $102 per barrel in August 2026, roughly five times the $20-to-$25 historical average. That gap is the whole story.

What Is the Diesel Crack Spread?

The crack spread is the profit margin a refinery earns converting crude oil into finished fuel, calculated as the price of the refined product minus the price of the crude oil used to make it.

Refiners commonly measure this using the “3-2-1 crack spread”: three barrels of crude oil in, converted into roughly two barrels of gasoline and one barrel of diesel out. A wider spread means refiners are earning more per barrel processed — which is exactly what’s happening now, and it’s a warning sign for supply, not a sign of healthy demand.

Why Refining Capacity, Not Crude, Is the Real Story

An estimated 7 to 8 million barrels a day of global refining capacity is currently offline, driven by Ukrainian strikes on Russian refineries, a resulting Russian export ban, and lingering disruption from the US-Iran conflict around the Strait of Hormuz.

Diesel is hit harder than gasoline in this kind of disruption because Middle Eastern refineries normally export large volumes of diesel-equivalent distillate fuel westward to Europe and beyond. When that flow is disrupted, there’s no quick substitute — building new refining capacity takes years, not weeks. US distillate inventories sat at roughly 107.1 million barrels in early August 2026, the lowest level for that time of year since 1996.

A Canadian Exposure Most Coverage Is Missing

Canada has a specific, underreported exposure to this global refining crisis: Irving Oil’s Saint John refinery, the country’s largest, is going offline for ten weeks starting in September 2026 — and no pipeline connects Alberta’s crude supply to Atlantic Canada to help fill the gap.

That story — including how a since-collapsed Keystone XL pipeline revival ties directly into it — is covered in full in Canada’s Diesel Blind Spot, which also traces the connection back to this month’s US-Canada trade talks collapse.

FAQ

Is the diesel shortage caused by a lack of crude oil?

No. Crude oil supply has remained relatively stable through 2026. The shortage is in refining capacity — the ability to convert crude into finished diesel — not in the crude itself.

Will diesel prices come back down soon?

Analysts don’t expect a quick normalization. Refining capacity lost to strikes and conflict-related disruption takes years to rebuild, and diesel inventories were already at multi-decade lows before the current disruptions began, leaving little buffer.

How does this affect Canada specifically?

Canada faces a compounding, regional version of this crisis: Eastern Canada’s refining capacity has shrunk for years, its largest refinery is about to go offline for an extended maintenance window, and no pipeline exists to move Western Canadian crude east to help. See Canada’s Diesel Blind Spot for the full breakdown.