Van fleets are one of the fastest-growing segments of UK road transport, and fuel costs represent a major and controllable expense. Fitting speed limiters to large vans — restricting top speed from 70 mph to 60 mph — can cut fuel consumption by up to 12%, delivering significant savings across a fleet of any size. Use the calculator below to enter your fleet details and see your projected annual fuel saving.
How We Calculate Your Savings
The calculator takes your fleet size and annual mileage per vehicle, then estimates baseline fuel consumption using typical large van MPG figures at unrestricted speeds. The key physical principle is that aerodynamic drag increases with the square of speed: at 70 mph a large van is working significantly harder than at 60 mph, burning proportionally more fuel per mile.
Reducing a large van from 70 mph to 60 mph cuts fuel consumption by approximately 12% on the affected portion of journeys. We apply this saving to the motorway/high-speed proportion of a typical van route, then multiply by your diesel price to produce an annual cost saving. CO₂ savings are calculated at 2.68 kg per litre of diesel saved, giving you a figure ready for your sustainability reporting.
Why Fit a Speed Limiter?
Fuel cost is the primary driver for most van fleet operators. Large vans travelling motorway routes regularly hit 70 mph or above, and the fuel penalty for this is substantial. A 12% fuel saving is achievable without any reduction in journey time that materially affects operations — the difference between 70 and 60 mph on a 100-mile motorway run adds less than 10 minutes.
Speed limiters also support compliance with evolving legislation. From 2024, all new cars and vans sold in the EU must be fitted with Intelligent Speed Assistance (ISA) as standard under EU Regulation 2019/2144. Retro-fitting speed limiters to existing van fleets ahead of any future mandate demonstrates proactive compliance and may be viewed favourably by insurers and contract counterparties.
Reduced vehicle speeds directly translate to improved safety outcomes. Van drivers are statistically over-represented in serious road traffic collisions, and high speed is a significant contributing factor. Speed limiters remove the option of excessive speed, reducing both the likelihood and severity of incidents, and giving fleet managers a verified, auditable record of speed compliance.
Insurance premiums for van fleets with certified speed limiters are typically lower, and many commercial fleet insurers now actively request evidence of speed management technology as part of underwriting. Combining speed limiters with GPS fleet tracking — as with the AutoKontrol TrackSpeed system — provides the evidential record insurers need.
Frequently Asked Questions
Do vans need speed limiters?
In the UK, vans over 3.5 tonnes gross vehicle weight are legally required to have a speed limiter set to 90 km/h (56 mph). For lighter vans, there is currently no legal requirement, but the EU’s ISA mandate for new vehicles from 2024 and increasing fleet policy requirements are driving adoption across all van categories.
How much fuel can a van fleet save with speed limiters?
A large van restricted from 70 mph to 60 mph typically saves around 12% of fuel on motorway routes. For a fleet of 10 vans each covering 30,000 miles per year, total annual savings can exceed £15,000 at current diesel prices. Higher-mileage fleets and larger fleets see proportionally greater returns.
What speed does a van speed limiter set?
The appropriate set speed depends on the van’s gross vehicle weight and your operational requirements. For vans under 3.5 tonnes, 60–65 mph is a common fleet policy setting that maximises fuel savings while maintaining reasonable journey times. For vans over 3.5 tonnes, the legal maximum is 56 mph (90 km/h).
How long does it take to fit a speed limiter to a van?
Professional installation of an AutoKontrol speed limiter typically takes 2–4 hours per vehicle, including calibration and testing. Fleet installations can be scheduled to minimise operational disruption, with mobile fitting teams available for larger fleets.
Will a speed limiter affect my van’s performance?
A speed limiter restricts only the maximum speed — it has no effect on acceleration, load capacity, towing ability or any other aspect of the van’s performance below the set speed. Drivers will notice no difference in day-to-day driving; the limiter only activates when the set speed is reached.