No. 2 Diesel Fuel against the WTI crude price, both set to 100 in the first month they share
Sep 2026WPU057303 419WTI crude price 185
Sources: WPU057303 (No. 2 Diesel Fuel); EIA via FRED, MCOILWTICO.
Since 2017, this index has followed the WTI crude price in the same month and moved about as far as it over a year.
Over the 12 months to Sep 2026, the WTI crude price rose 52.1% and this index rose 115.2%.
Key figures
Since Jan 2017
+319.4%
161.1 to 675.6
12-month volatility
±16.4%
std. dev. of monthly change
Largest monthly rise
+38.4%
Mar 2026
10% cap would bind
23 of 36
months, annual base reset
From Jan 2017 to Sep 2026 the index went from 161.1 to 675.6, a change of +319.4%.
Highest reading in that period: 675.6 in Sep 2026. Lowest: 108.3 in May 2020.
Largest one-month rise: +38.4% in Mar 2026. Largest one-month fall: -28.4% in Dec 2022.
For a clause that resets its base every year, a 10% cap or floor would have limited the adjustment in 23 of the last 36 months.
Use it in a contract
Draft clause citing this series
A starting point citing this series by name and code. Replace the bracketed terms with your contract's actual scope before use.
The [affected portion] of the Contract Price shall be adjusted using US PPI — No. 2 Diesel Fuel (BLS series WPU057303), published by BLS.
Base Period: the index value published for September 2026 (or the month of contract signing, if different) is the Base Value.
Adjustment: at each Adjustment Date, the Current Value is the most recently published three-month average of the index (the Averaging Window). The Escalation Factor equals Current Value divided by Base Value.
Cap: the Escalation Factor applied under this clause shall not exceed 1.10 or fall below 0.90 (a 10% cap and floor) in any single Adjustment Date, regardless of the index's actual movement.
[Replace bracketed terms with your contract's actual affected-portion definition and adjustment-date schedule before use. This is a drafting starting point, not legal advice.]
The standard benchmark for a diesel fuel surcharge on a freight or transport contract, cited alongside the linehaul trucking index, since the two move on different schedules.
A diesel fuel surcharge compares a current-period Producer Price Index value for No. 2 diesel fuel to the value at contract signing (the base period), turns that into a ratio, then applies the ratio, often above a threshold, to the freight or transport-affected portion of the contract price. Clauses typically name the exact BLS series code, an averaging window, a publication lag, and a cap limiting the maximum adjustment.