AAA's national daily diesel average reached $5.9015 per gallon on September 7, the highest nominal figure in the association's published record table. The same table put the prior day's average at $5.8970, the week-earlier average at $5.6002 and the month-earlier average at $5.3313.
Those comparisons put the daily average 30.13 cents above one week earlier and 57.02 cents above one month earlier. The calculations use the unrounded figures on AAA's national page. They describe a retail benchmark, not the net price charged under a fleet card, bulk-fuel agreement or location-specific discount.
The Energy Information Administration's latest U.S. on-highway diesel figure is $5.599 for the week of August 31, down 5.3 cents from August 24. That does not contradict AAA's September 7 reading. EIA publishes a weekly survey on a different schedule and identifies September 9 as its next release, while AAA updates its national daily average more frequently.
EIA's August 31 regional figures also show why a national number cannot stand in for a lane. The Gulf Coast averaged $5.360 and the West Coast averaged $6.497, including $7.218 in California. A carrier's actual exposure varies again with purchase locations, taxes, discounts, tank capacity and how much fuel is bought in each region.
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For scale, 1,000 gallons at AAA's September 7 average cost $301.30 more than the same volume at its week-earlier average and $570.20 more than at its month-earlier average. Those are arithmetic scenarios, not estimates of a specific fleet's bill. They exclude rebates, contract pricing, purchase mix and any fuel surcharge recovered from a customer.
Fuel-surcharge recovery depends on the index, base price, adjustment cadence and mileage rules written into each agreement. A contract tied to EIA's weekly benchmark should not be recalculated from AAA's daily figure simply because the daily series moved first. Operations and billing teams need to preserve the contract's source and effective date when they update tables.
FreightNews infers that a fast daily-price move can widen the timing gap between cash paid at the pump and surcharge revenue billed under a weekly or monthly schedule. The size and direction of that gap still depend on contract terms, fuel-buying discipline, loaded and empty miles, utilization and invoice timing. The public benchmark alone does not establish margin loss or a customer pass-through.
The immediate control is a daily exception view: gallons by purchase location, effective net price, gallons per dispatched mile, surcharge index and date, billed recovery per mile, and the lag until the next reset. That turns the record headline into a measurable exposure without treating one national retail average as a rate for every truck, lane or customer.