Three days ago we wrote that diesel's inflection was "expected within 4 months." It showed up early.
EIA's June 8 reading puts diesel at $5.21/gal, down from $5.35 on June 1 and $5.64 at the May 4 peak — a 7.6% slide in five weeks. Gasoline followed the same path: $4.63 in mid-May to $4.28 on June 8, down 7.5%. For gas-powered last-mile fleets — which is most of them — that's the first sustained relief since the spring run-up began.
Worth saying plainly: the signal called the direction but not the timing. Our read was that the rate of increase would slow inside four months. Instead the level turned within one. We'd rather flag that miss ourselves than pretend the model is a crystal ball — fuel is the most mean-reverting, headline-jumpy input we track, and we treat it accordingly: dampened, not extrapolated.
What the pullback is worth in operating terms: a gas van averaging 15 mpg on a 120-mile route burns about 8 gallons a day. At the May peak that was $37.00 of fuel; at June 8 prices it's $34.25. Call it $2.75 a day per van — just under 2 cents per stop on a 150-stop route. Across a 40-van fleet, roughly $2,400 a month back. Real money, quietly returned the same way it was quietly taken.
Now the part that should temper the celebration. Five-year context: gasoline at $4.28 is still above its 5-year 90th percentile ($4.25). Diesel at $5.21 sits above its 75th percentile ($4.54) and only just below its 90th ($5.32). This is not cheap fuel. This is slightly-less-expensive fuel at levels that would have been a crisis headline in 2022.
Two practical implications:
Don't trade away your surcharge structure at the bottom of a dip. If a contract negotiation lands this month, the counterparty will point at the five-week slide as the new normal. The 5-year distribution says otherwise. Surcharge triggers calibrated at the May peak deserve a review; surcharge floors do not deserve to be given back.
Don't let the dip rewrite acquisition math. A fuel line that drops 7% changes monthly operating cost today; it does not change the right assumption for a 36-month lease signed this summer. We model fuel for term decisions off the distribution, not the latest print — in either direction.
The floor still isn't visible, and neither is the ceiling. What's visible is the range — and both fuels are still in the expensive end of it.
See what current fuel prices do to your cost per stop — free calculator at pexara.ai/calculator