A single van saving 8% on fuel is nice. Ten vans saving 8% is a budget line — typically thousands a year back, plus drivers who stop complaining about gutless loaded pulls. We tune fleets the way operators need it done: volume rates, on-site visits around your schedule, a pilot vehicle to prove the numbers, and paperwork on every van.
A loaded van is a different machine to the empty one the factory calibrated. We tune for the van you actually run.
Factory van calibrations are written for a vehicle that barely exists: unladen, driven gently, on a emissions test cycle. Your vans live loaded to the axles, driven by people on a schedule, up the same hills every day. That mismatch is where the money leaks — drivers flogging engines that won't pull low down, fuel burned in downshifts a better torque curve would have avoided, and delivery schedules carrying the cost.
Fleet calibration fixes the mismatch. Low-rev torque filled in hard — up to 25% more where loaded vans need it — so pulls that demanded third gear take fifth. Throttle response smoothed so different driving styles converge toward the efficient one. Injection refined at the cruise sites where your vans spend their motorway hours. Emissions systems left completely intact, because compliance isn't optional for a business. The result per vehicle: typically 6–12% off the fuel bill and a van drivers genuinely prefer.
The commercial wrapper matters as much as the calibration. We start with a pilot vehicle so you can verify savings on your own telematics before committing the fleet. Visits happen on-site, around your rota — evenings and weekends included — at roughly an hour per van. Every vehicle gets its original file archived, its calibration documented, and its record kept; when a van is sold or returned off lease, reverting it takes one visit.
Six workstreams in every fleet calibration — tap each one for the operator's version.
Low-rev torque raised substantially so a loaded van stops needing two downshifts for every gradient.
The single change drivers notice most: useful pull from 1,400 rpm instead of 2,200. Loaded hill starts, slip-road merges and A-road overtakes all happen a gear higher and a lot calmer — which is also exactly where the fuel saving comes from.
Injection timing and pressure refined at the steady-state sites where fleet vans live.
Fleet mileage is mostly cruise, so that's where the calibration concentrates: cleaner combustion at 56–70 mph load sites, smoother torque holding speed on gradients. Tenths of a percent here compound across every motorway hour your fleet runs.
Smoothed throttle mapping that nudges every driving style toward the efficient one.
You can't retrain every right foot, but you can calibrate the pedal so aggressive inputs waste less: progressive response, no jumpy top-of-travel surge, flat spots removed so nobody over-presses to compensate. The fleet's worst driver gets better without knowing it.
Combustion kept clean and EGTs healthy — kinder to the DPF cycle that plagues urban fleets.
Stop-start fleet duty is the classic DPF killer. A cleaner-burning, torquier calibration driven at lower revs produces less soot per mile and regenerates more reliably — everything stays fitted and compliant, it just suffers less. Vans already blocked need assessment first.
Speed limiters set, adjusted or standardised across the fleet to match your policy and insurance terms.
Mixed fleets often carry mixed limiter settings inherited from different suppliers. We standardise them to your chosen figure — 56, 62, 70 — in the same visit as the economy calibration. One policy, every van, documented.
Every van's original file archived, every calibration documented — and any vehicle revertible in one visit.
Fleet vehicles get sold, returned off lease and audited. Each van's record shows what was done and when; the original software is archived for its lifetime; and de-fleeting a vehicle back to stock is a routine one-visit job, not a problem.
Vans, mileage, MPG, fuel price — see what 6–12% means across the whole operation, per year.
| Scenario | Annual fleet fuel cost* | Annual saving |
|---|---|---|
| Standard calibration | ~£35,900 | — |
| Fleet tuned, +6% | ~£33,900 | ~£2,000/yr |
| Fleet tuned, +12% | ~£32,100 | ~£3,800/yr |
*Illustrative at ~£1.50/litre. The interactive calculator above uses your own figures.
How a fleet programme actually runs — proof first, rollout second, paperwork throughout.
Three things we put on the table before any fleet agreement — because surprises cost relationships.
Remapping a leased vehicle without the leaseco's blessing, or a van you intend to warranty-claim on, creates exactly the kind of problem fleet managers exist to avoid.
We ask about ownership structure up front and tune what's cleared. Owned vans are simple; leased ones need a yes in writing first — and full reversion before hand-back is a service we provide as routine.
The urban multi-drop van and the motorway tramper will bank different percentages from the same calibration. A single fleet-wide promise would be a guess.
That's what the pilot van is for: your vehicle, your routes, your telematics, measured over weeks you choose. The fleet decision gets made on your own data, not our brochure.
High-mileage fleets carry vans with lazy turbos, sooted EGRs and half-blocked DPFs. Calibrating over a fault doesn't fix it — it hides it until it's expensive.
Every van gets a diagnostic health check before its flash. Vans that aren't ready get reported with findings instead of tuned — protecting your fleet is the job, not flashing it regardless.
The first step costs nothing: tell us fleet size, vehicle types and rough mileage — you'll get a straight quote and a pilot proposal.
Volume-based: the per-van rate steps down as fleet size steps up, quoted as a single clear figure once we know vehicle count, models and where they're based. The pilot van is charged at standard rate and credited into the fleet price when you proceed. No retainers, no per-mile royalties — one price per van, documented.
We come to your yard and work around the rota — evenings after the last drop, weekend blocks, or rolling visits that take vans one at a time as they're free. Each van needs roughly an hour. A ten-van fleet is typically completed across two or three visits without a single missed delivery slot.
Please do — it makes the conversation easier. The pilot van runs for a few weeks while your telematics or fuel-card data does the measuring on your real routes with your real drivers. You compare before and after on your own numbers, then decide. Fleets that measure properly are our favourite customers, because the data does our selling.
Leased vehicles need the funder's written permission — some allow calibration changes, many don't, and we won't tune around that. Warranty exposure is the same as any remap: dealers can detect software changes, so weigh it per van's age. Every vehicle's original file is archived and full reversion before lease return or warranty work is a routine visit.
Normal, and fine. Each van is calibrated individually for its exact engine and variant — a Transit Custom file, a Sprinter file and a Crafter file are three different pieces of work, not one template. What standardises across the fleet is the outcome: consistent driveability, consistent limiter policy if you want one, and consistent documentation per vehicle.
Emissions systems stay fully intact, so MOT and roadside compliance are unaffected. Insurance: calibration changes should be declared on the fleet policy — the per-van documentation we provide makes that an administrative note rather than a project. Speed-limiter settings are kept inside your policy terms, and nothing we do touches tachograph or O-licence obligations.
Loaded torque and MPG for one work van — Transit, Sprinter, Vivaro and more from £150.
From £150 See van remapping // Fleet health Vehicle DiagnosticsWarning lights and limp modes across the fleet diagnosed properly — on-site, documented per van.
£40 Book diagnostics // How we visit Mobile RemappingThe on-site service that makes fleet work practical — coverage, kit and how a visit runs.
No call-out fee See mobile servicePilot vehicle, your telematics, your routes — then a volume rate for the rest. Fleet size, models and mileage is all we need to quote.