Cushing Oil Tanks Drain Near Empty as Diesel Feedstock Tightens
Storage tanks in Oklahoma are being drawn down so fast that producers can't refill them, signaling tight crude supply that could push diesel prices higher.
Why are Cushing oil inventories dropping so fast?
Crude oil inventories at Cushing, Oklahoma, the delivery point for U.S. benchmark oil futures, have fallen near minimum operating levels as customers pull barrels faster than producers can replace them. The drawdown signals tight crude supply in the domestic market, a condition that typically translates to higher diesel prices at the pump within weeks.
Cushing's tank farms hold the crude that refineries turn into diesel, gasoline, and jet fuel. When those tanks run low, refiners pay more to secure feedstock, and that cost moves downstream to the rack price carriers see on their fuel cards. The current drain rate suggests strong demand for refined products, particularly diesel, at a time when domestic crude production has not kept pace.
Producers are struggling to refill the tanks because pipeline capacity into Cushing is already running near maximum utilization, and drilling activity in the Permian Basin and other shale plays has not increased enough to offset the withdrawal rate. The mismatch between supply and demand at the storage hub creates upward pressure on crude prices, which refiners pass through to wholesale diesel within two to four weeks.
What low Cushing inventories mean for diesel prices
Historically, when Cushing inventories fall below 25 million barrels, diesel prices at the wholesale level rise an average of 8 to 12 cents per gallon within 30 days. The current drawdown puts inventories in that range, based on industry storage minimums required to maintain pipeline flow and tank operations. For a five-truck fleet running 500 miles per day per truck at 6 mpg, an 8-cent increase adds $200 per week to the fuel bill.
The timing matters because diesel demand typically peaks in late summer and early fall as harvest season begins and retailers stock up for the holiday shopping period. If Cushing inventories remain low through July and August, the seasonal demand surge will hit a market already running tight, amplifying price volatility. Fleets that lock in fuel hedges or negotiate fuel surcharge floors with shippers in the next 30 days may capture better terms than those who wait.
Refineries along the Gulf Coast, which supply much of the diesel consumed in the Southeast and Midwest, draw a significant portion of their crude from Cushing via pipeline. When those refineries pay more for feedstock, the increase shows up in the diesel index prices that trigger fuel surcharges in most carrier contracts. Carriers on percentage-based surcharges will see automatic adjustments, but those on fixed-rate contracts or lanes without surcharge clauses will absorb the cost directly.
The supply side: why producers can't keep up
U.S. crude production has been relatively flat since early 2025, hovering around 13.2 million barrels per day, while refinery runs have increased to meet strong diesel and jet fuel demand. The gap between production growth and refinery demand has forced the market to draw down stored crude, with Cushing bearing the brunt because of its central role in the pipeline network.
Drilling rig counts in the Permian Basin, the largest U.S. oil field, have not increased significantly in the past six months despite higher crude prices. Producers cite labor shortages, equipment lead times, and capital discipline as reasons for holding production steady rather than ramping up quickly. That discipline benefits oil company shareholders but leaves the market vulnerable to supply shocks when demand spikes or when geopolitical events disrupt imports.
The drawdown at Cushing also reflects reduced crude imports from Canada and Mexico, which have faced their own production constraints and pipeline bottlenecks. Canadian heavy crude, a key feedstock for Midwest refineries, has been in shorter supply due to maintenance outages and pipeline capacity limits. Mexican production has declined as state-owned Pemex struggles with underinvestment and aging fields.
What a tight crude market means for small fleets
For carriers running 1 to 50 trucks, the immediate impact is higher diesel costs if Cushing inventories stay low and crude prices rise. The secondary impact is weaker freight demand if higher fuel costs push up shipping rates enough to slow consumer spending or industrial activity. Gasoline hit $4.48 in early May, and diesel typically tracks 20 to 40 cents higher than gasoline at the retail level, putting current diesel in the $4.70 to $4.90 range in many markets.
Fleets with fuel surcharge agreements tied to the Department of Energy's weekly diesel index will see automatic rate adjustments, but those adjustments lag actual pump prices by one to two weeks, creating a cash flow gap. Owner-operators on spot loads or fixed-rate contracts bear the full cost increase with no offset unless they renegotiate terms or shift to lanes with better fuel economics.
The broader risk is that tight crude supply persists into the fall, when diesel demand from agriculture and retail logistics peaks. If inventories at Cushing remain near minimum levels through September, the market will have little buffer to absorb a supply disruption, whether from a hurricane in the Gulf of Mexico, a refinery outage, or a geopolitical event that cuts imports. In that scenario, diesel prices could spike 30 to 50 cents per gallon in a matter of days, as they did during previous supply shocks in 2008 and 2022.
Carriers who can shift to more fuel-efficient routes, consolidate loads to reduce deadhead miles, or negotiate fuel surcharge floors in the next 30 days will be better positioned if the crude market tightens further. Those who wait risk locking in contracts or taking loads at rates that don't cover a fuel price jump.
