NEW YORK — U.S. retail diesel prices have surged to an unprecedented level, surpassing the previous peak set in 2022. According to AAA data, the national average reached $5.9015 per gallon on Monday, September 7, 2026. This marks a 5.38% increase from the prior week's $5.6002 and a staggering 59.12% jump from $3.7088 a year ago. The reading, taken at 11:46 a.m. EDT, represents the highest nominal price on record for the fuel.
The spike comes as U.S. equity markets were closed for Labor Day, so there was no immediate stock reaction. However, the implications for the transportation sector are significant. The iShares U.S. Transportation ETF (BATS:IYT), which tracks airlines, railroads, and trucking companies, will likely face pressure when trading resumes. The critical question is how much of the fuel cost increase carriers can pass on to customers through surcharges.
Large operators like FedEx (NYSE:FDX) and UPS (NYSE:UPS) use fuel surcharge formulas that rely on government data, which lags behind real-time pump prices. This lag can create a timing mismatch, leaving carriers to absorb higher fuel costs temporarily. For example, FedEx's Ground surcharge for the week of September 7-13 is set at 27.00%, based on the EIA diesel price from August 31. If the next EIA reading reflects the current $5.90 price, the surcharge could rise to approximately 28%, shifting more cost to shippers.
Supply Tightness Persists
The latest government data shows distillate inventories remain tight. The EIA reported 104.2 million barrels of distillate fuel for the week ended August 28, which is 14% below the five-year average and 10.1% lower than the same period last year. Despite a 6% year-over-year decline in four-week distillate demand, refineries are running at 98% capacity, yet production has slipped to 5.1 million barrels per day.
Geopolitical factors are exacerbating the supply crunch. Disruptions in Middle East fuel flows and Ukrainian attacks on Russian refineries have tightened the global product market, according to reports. Jason Miller, a supply-chain professor at Michigan State University, noted that upcoming refinery maintenance could leave inventories at unusually low seasonal levels, a risk that extends beyond just the Labor Day driving season.
Carrier Impact and Surcharge Dynamics
TFI International (NYSE:TFII) offers a glimpse into how carriers can recover fuel costs. In the second quarter, TFI's fuel-surcharge revenue surged 60% to $389.9 million, while base revenue grew only 5.9%. The company's adjusted EBITDA margin improved to 19.2%, demonstrating that effective surcharge mechanisms can mitigate fuel price shocks. However, TFI also lists fuel price volatility as a risk, and a full recovery in September is not guaranteed.
IYT's portfolio is diversified, with rail (31.90%), cargo ground transport (17.68%), air freight (16.76%), and passenger airlines (14.55%). Higher diesel prices could make rail more competitive, but falling freight volumes due to customer cost-cutting could impact all segments.
Canadian Tax and Upcoming Data
Adding to the cost pressure, Canada's federal diesel excise tax returns on September 8, adding four Canadian cents per liter. For a 500-liter commercial fill, that's an extra CAD 20, a modest but notable increase for cross-border operators.
The next critical data point will be the EIA's weekly petroleum report, delayed to Thursday, September 10, at noon EDT. A significant inventory build would ease concerns, while another low reading would keep pressure on surcharges and refining margins. For investors in IYT, the focus will be on how quickly carriers can adjust surcharges and whether freight volumes hold up.
