The national average price for diesel hit $5.85 a gallon on September 4, according to AAA’s daily fuel price tracker — a jump of nearly 7 cents in a single day that pushed the price past the previous all-time high and left truckers, farmers and anyone who buys anything that arrives by truck bracing for higher costs.
Key Points
- Diesel’s national average rose to $5.85 per gallon on September 4, up from $5.7832 the day before, according to AAA.
- That already tops the prior record of $5.8159 a gallon, set in June 2022, according to AAA data reported by Fox Business.
- Diesel is up more than $2 a gallon compared with a year earlier, when the national average sat at $3.7121, per the same AAA figures.
- The federal Energy Information Administration’s separate weekly survey put on-highway diesel at $5.599 a gallon as of August 31 — up $1.865 from a year earlier — a slower-moving measure that shows the same trajectory.
By the Numbers
- Diesel sat around $5.37 a gallon just a month earlier, meaning prices have climbed nearly 50 cents in roughly four weeks, according to AAA data reported by Fox Business.
- Regular gasoline, by comparison, sat at $4.1474 a gallon on September 4 — up only a fraction of a cent from the day before, per AAA — meaning diesel is climbing far faster than gasoline right now.
- AAA’s own tracker flagged the timing directly, noting both fuels are on track to set Labor Day records just as the holiday travel and shipping season peaks.
The spike traces back to a months-long conflict involving Iran that has disrupted global crude supply since late February, according to reporting in the Boston Globe, which cited Brent crude climbing to more than $95 a barrel from around $70 before the conflict began. Diesel tends to track crude more directly than gasoline because it’s a heavier, less-processed fuel with fewer substitutes in commercial use.
Because diesel powers most of the trucks, trains and farm equipment that move freight and food across the country, price swings at this scale don’t stay contained to the pump. Fuel costs make up a meaningful share of what it costs to grow, process and ship groceries, meaning a diesel spike this size tends to show up weeks later on store shelves rather than staying a trucking-industry problem alone.
Context
With diesel already above its 2022 peak and gasoline hovering near $4.15 a gallon nationally, the shipping-heavy Labor Day stretch will test how much further prices climb before any relief arrives.