Your carrier’s 5.9% hike is also a carbon decision. UPS (United Parcel Service) lifts ground, air and international rates an average of 5.9% on 21 December, plus a 5% fuel surcharge from the same day [1]. CarParts.com has already answered that price. It moved more than 6,000 packages through its own vans in the quarter to 3 October and wants 300,000 a year, about 5% of what it ships [2]. When a shipper runs the last mile itself, the carbon changes line, because the owner of the van decides which line it sits on.

At a glance

  • The shift: A 5.9% hike pushes shippers to run their own final mile, which decides the emissions line.
  • The number: 5% of outbound volume is the share CarParts.com wants on its own network.
  • The risk: Insourcing can cut real miles and still raise the reported number.

The rate card is a boundary

The timeline runs on two clocks. UPS announced the rise on 26 October, six weeks before it lands, and FedEx’s own 5.9% takes effect on 4 January 2027 [1]. CarParts.com’s network grew through that quarter, and three of its four distribution centres now run next-day delivery through it [3]. California’s first corporate carbon reports, which cover a firm’s own fuel and power, were due on 10 November [7].

Those dates add up to a line, not a discount. When a parcel rides a national carrier’s truck, the shipper buys a service and the fuel burns in someone else’s vehicle. Federal guidance calls a company’s direct emissions Scope 1 when they come from sources it “owns or controls”, and names fuel burned in its vehicles as the example [5]. The Scope 3 standard puts the bought version in its own slot, “Upstream transportation and distribution” [6]. Move the box to your own van and the tonne does not grow or shrink. It changes line.

I keep coming back to how little of this shows up in either document. The rate notice prices a service. The earnings release reports a margin. Neither says the two numbers describe one choice seen from opposite sides of a boundary. This desk has already written about which lines a carbon report leaves open. What is new is that the choice now arrives with a price on it.

By the numbers

  • 6,000-plus packages: CarParts.com’s own network volume last quarter, about double the prior one [2].
  • 33.4% gross margin: What is left after the cost of goods, up 30 basis points, mostly on lower freight costs [3].
  • Diesel at $6.13: The United States on-highway average in the week of 9 November, $3.837 above its year-ago reading [4].

What I’m watching next

CarParts.com is not alone, and that is the part worth tracking. The same trade record notes Tractor Supply delivering more large items itself, and ties both moves to a run of fast-rising shipping rates [2]. The operators for whom the sums work today are the ones with a depot, dense routes and their own drivers.

Three things would tell us whether this stays a margin story or becomes a reporting one. First, disclosure: whether more shippers publish the share of volume they have taken in-house, the way CarParts.com published a 5% target. That share is the slice they now measure from their own fuel, not estimate from an invoice. Second, the carriers’ reply. A book-wide rise of 5.9% still leaves room to price a dense route lower. UPS also charges extra handling at a 50-pound floor instead of 40, which hits the bulky parcels shippers most want to keep [1].

Third, timing: first-year filers may use data they already held as of 5 December 2024, so an insourcing wave shows up in the numbers a cycle late [7].

I am watching how many shippers follow with a published share of insourced volume, because that number is what turns a margin story into a reporting one.

The catch

The honest version of the insourcing claim is small. Five per cent is a target, not a trend, and it is 5% of one retailer’s outbound volume. Insourcing can add miles too. A thin route that a carrier merged with three nearby accounts becomes three vans when each shipper runs its own, and that shared density is what made the carrier’s mile cheap. Nothing in this run measures grams per parcel for either model, and no source ties an insourced box to a checked emissions cut.

What the documents do support is narrower and still useful. The same delivery is counted on different lines depending on who owns the vehicle, and the rate card is pushing ownership. My reading, held loosely: for a small but growing slice of volume, the cheaper mile and the reported mile will move in opposite directions. The people who notice first will read both the rate card and the carbon report.

Related reading

Sources