Truck fuel consumption per 100 km: real numbers from public tests

"What should a truck burn per 100 km?" is the most common question in fleet cost control — and the internet mostly answers it with anecdotes. Here are the numbers that actually have public sources behind them, and what they do (and don't) tell you about your own fleet.

Method note: every figure below comes from a cited public source — test programmes, regulatory studies, manufacturer records. None of it is our own client data; we publish no own benchmark until we have analyzed enough fleets for it to be honest.

The headline numbers for a 40-tonne tractor-trailer

  • Typical European long-haul tractor-trailer: ~32.6 l/100 km, and ~34.3 l/100 km in regional delivery cycles — the ICCT's baseline for EU heavy-duty vehicles (2018 study).
  • Best-in-class vehicles in the same programme: ~29.9 l/100 km — roughly 8–9 % better than the average, with existing technology.
  • A modern tractor on real customer routes: ~25.0 l/100 km — the average across Daimler's "Fuel Duel" programme, which ran 1,000 back-to-back comparison tests of a Mercedes-Benz Actros against customers' own trucks on their own routes.
  • The physical floor under ideal conditions: 19.44 l/100 km with a 25-tonne payload — a supervised record run (2008), useful only as a reminder of how far ideal conditions sit from daily operations.
  • Technology potential: ~24 l/100 km for a long-haul tractor-trailer with all cost-effective efficiency technology applied — the ICCT's 2020s-horizon estimate.

Lab values vs. the road

Official figures understate reality: the ICCT's comparison of VECTO (the EU's certification simulation) against real-world logging found actual consumption running roughly 11 % above certified values in European trucks. If your trucks burn more than a brochure says, that alone is not a finding — it's expected.

What payload does

The single biggest legitimate driver of variance is load. Public measurement programmes put the effect at roughly 0.4–0.95 l/100 km per additional tonne (UK Department for Transport payload study; Finnish real-route research on heavy combinations). A practical rule of thumb: +3 tonnes ≈ +1.5–3 l/100 km. A truck that runs fully loaded one month and half-empty the next will swing several litres per 100 km without anything being wrong.

So what is "normal" for YOUR fleet?

The public numbers give you a corridor, not a verdict:

  1. Take the class baseline (~30–33 l/100 km for a loaded 40 t long-haul set).
  2. Adjust for your reality: route profile, average payload, winter share, vehicle age.
  3. Compare each vehicle's actual monthly l/100 km (fuel-card litres ÷ km) against that norm — and treat the deviation, not the absolute number, as the signal.
  4. Investigate deviations that load, route or season cannot explain. Most have operational causes; the remainder deserve verification.

That comparison is exactly what our free check automates: enter your vehicle class, monthly kilometres and monthly fuel spend, and you get an A–F grade plus a euro estimate of the gap against a calibrated norm — in about 60 seconds, no file, no signup, nothing stored. (How the calculation works.)

Sources

  1. ICCT: Fuel efficiency technology in European heavy-duty vehicles (2018) — theicct.org; fact sheet — PDF
  2. ICCT: VECTO versus real-world testing (17 Dec 2025) — theicct.org
  3. Daimler: Mercedes-Benz Actros in the Fuel Duel — automotiveworld.com
  4. Mercedes-Benz archive: Just 19.44 liters with a 25-tonne payload (2008) — mercedes-benz-publicarchive.com
  5. DfT/DEFRA: Effects of Payload on the Fuel Consumption of Trucks — PDF
  6. Fuel economy analysis of conventional and hybrid heavy vehicle combinations over real-world operating routes — sciencedirect.com

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