Speed Limiter or Telematics or Training: Which Cuts Fuel?

A speed limiter enforces a top speed. Telematics measures and reports, but the driver still chooses how to drive. Driver training teaches, and then depends on drivers keeping it up. For fuel, a limiter is the only one of the three that holds the speed by itself. The best results come from using more than one.

What is the difference between a speed limiter, telematics and driver training?

Each does a different job, and fuel only falls if the driver’s behaviour changes. This table shows how they differ:

	Driver training	Telematics	Speed limiter
What it does	Teaches techniques	Measures and reports driving	Enforces a maximum speed
Who decides the speed	The driver	The driver	The cap
Depends on drivers remembering	Yes	Yes, plus a manager acting on reports	No, for top speed
Covers idling, braking, acceleration	Yes, if applied	Reports on them	No
Shows you what is happening	No	Yes	Not by itself

None of these is better in every respect. The question is which gap in your fuel management each one fills.

How does driver training affect fuel use?

It can reduce fuel use for as long as drivers apply what they learned. Training covers the full set of techniques: anticipation, smooth acceleration, gear choice, idling. A limiter cannot teach any of those.

The weakness is persistence. Training is only as good as the habits it leaves behind, and habits drift back under time pressure. We do not have a published figure for how quickly that happens, so measure it in your own fuel data: compare the months after training with the months before and after. See fuel efficient driving for fleets for the policy side.

How does telematics affect fuel use?

Telematics shows you where fuel is going, and it changes fuel use only if someone acts on what it shows. It reports speed, idling, harsh braking and acceleration, routes and mileage. It gives a manager the evidence for a conversation, and gives you the baseline you need to prove any other measure works.

What it does not do is stop a driver doing 75 on a motorway. The driver still chooses. Telematics is also the way to find your share of fast miles, which is the figure that sets the size of any speed saving. Our integration guide covers how the two work together.

How does a speed limiter affect fuel use?

It removes the miles driven above the cap, so their fuel penalty goes away. The Department for Transport’s fuel consumption curves in the TAG data book (v2.03, May 2026) show the size of that penalty:

Vehicle	70 to 60 mph	68 to 60 mph
Diesel van	not covered	14.5%
Petrol van	16.1%	12.6%
Diesel car	9.6%	7.5%
Petrol car	8.9%	6.8%

DfT’s diesel van curve stops at 68 mph. These percentages apply to the miles moved from the higher speed to the lower one. The fleet-wide saving depends on the share of miles you drive above the cap, which is why a van on town rounds sees little and a van on motorway runs sees a lot.

A CE Delft study for Novem (March 2009) put limiters on 177 vans and 30 trucks of 3.5 to 12 tonnes, across 16 companies, for a year. The average fuel saving was 5%. A limiter does not change idling or how hard a driver accelerates, which is why the saving is a fleet average and not a ceiling.

Which one should I choose to cut fuel?

Choose by what your fuel data says is wrong. A few common cases:

• Drivers regularly exceed your target speed on motorways: a limiter fixes this directly. Telematics will tell you how often it happens, but not stop it.
• You do not know where fuel is going: start with telematics, so you can see speed, idling and routes.
• Idling and harsh driving are the problem: telematics to measure, training and feedback to change it.
• You have good driver habits but no consistency across the fleet: a limiter sets a floor for every vehicle.

For a numbered list of what to measure under each heading, see the fleet fuel savings checklist.

Can I use all three together?

Yes, and they cover each other’s weaknesses. Telematics finds the problem, training explains the better habit, and a limiter holds the top speed whatever the driver does. AutoKontrol’s TrackSpeed combines a speed limiter and GPS tracking in one device, with one installation and one subscription. You get the cap and the data.

Training sits alongside it. We do not claim a combined percentage, because none has been published for a fleet like yours. The honest route is to measure litres per 100 miles before you start and track it afterwards.

What does it cost to ignore the speed gap?

Take 20 diesel vans doing 25,000 miles a year at 36 mpg, with 35% of miles at 68 mph and diesel at 199.22p a litre (DESNZ, week of 26 October 2026). Each van burns 3,157 litres. Moving the fast miles to 60 mph saves 3,157 x 0.35 x 0.145 = 160 litres a van, about £319, and £6,384 across the fleet. The 35% is an assumption for the example. The full worked example shows how the answer moves with the share.

Frequently Asked Questions

Is a speed limiter better than telematics for fuel savings?

They do different jobs. A limiter holds a top speed, which saves fuel on every mile that would have been driven above the cap. Telematics measures and reports, so it helps you manage idling, harsh driving and routes, but the driver still chooses the speed.

Do I need telematics if I have a speed limiter?

You do not need it to make the limiter work, but it helps. Telematics shows you idling, routes and mileage, which a limiter does not cover. It also gives the baseline to prove the saving.

Is driver training enough to cut fuel use?

It can help, but it depends on drivers keeping up what they learned. Without something to reinforce it, habits tend to slip. A limiter takes the top speed out of that equation.

How much fuel does a speed limiter save compared with telematics?

There is no published like-for-like comparison, so we will not give one. The CE Delft trial recorded a 5% average fuel saving from limiters on vans and light trucks over a year. Telematics savings depend on how a manager uses the reports.

What is TrackSpeed?

TrackSpeed is AutoKontrol’s speed limiter and GPS tracker in one device, with one installation and one subscription. It enforces the cap and reports the data. See the TrackSpeed page.

Cut your fleet’s fuel bill

Work out what the speed element is worth to you with the speed and fuel calculator. It takes your vehicle type, mileage and the share of miles driven fast and shows the litres and pounds at a lower cap.

The Department for Transport’s fuel consumption curves show a diesel van using 14.5% less fuel per mile at 60 mph than at 68 mph. A limiter enforces that every time, and how much it saves your fleet depends on how many of your miles are driven above the cap.

Talk to us. AutoKontrol has made speed limiters in Britain since 1985, with nationwide installation where we come to you. Book a free consultation or get a quote.