Fuel Efficient Driving for Fleets: Why Training Fades

The most effective fuel efficient driving policy for a fleet fixes the settings drivers cannot be relied on to remember. The biggest is top speed: the Department for Transport’s curves show a diesel van using 14.5% less fuel per mile at 60 mph than 68 mph. Training teaches the habit, but a speed limiter holds it.

What is fuel efficient driving for a fleet?

It is driving that uses the least fuel for the journey: steady speeds, early lifting off, gentle acceleration and braking, no idling. For a single driver it is a skill. For a fleet it is a policy, because the cost sits with the business and the behaviour sits with dozens of people.

A fleet manager does not control how each driver feels at 5pm on a Friday. A policy has to work anyway. Writing the right policy means deciding which parts of fuel efficient driving you can enforce and which you can only encourage.

Which fuel efficient driving tips matter most for fleets?

Speed, then smoothness, then idling. The tips in this order:

1. Cap the top speed on fast roads. The only technique with firm published figures, covered below.
2. Anticipate and drive smoothly. Lift off early, avoid late hard braking, accelerate progressively.
3. Stop idling. Engine off when loading, waiting or parked.
4. Check tyre pressures. Under-inflated tyres drag.
5. Carry only what the job needs. Dead weight and roof racks cost fuel.
6. Plan routes and drops. Fewer miles and less congestion.

For a longer list with what to measure for each, use the fleet fuel savings checklist. For how the techniques rank, see which driving technique can save fuel.

How much does speed matter in the policy?

It matters more than any other item, and it is the one with published figures. The Department for Transport (DfT) fuel consumption curves in the TAG data book (v2.03, May 2026, table A1.3.8) give the fuel saved per mile at a lower speed:

Vehicle	70 to 60 mph	68 to 60 mph	68 to 56 mph
Diesel van	not covered	14.5%	20.0%
Petrol van	16.1%	12.6%	16.4%
Diesel car	9.6%	7.5%	10.1%
Petrol car	8.9%	6.8%	8.8%

The diesel van curve is only valid up to 68 mph. For 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), the saving from 60 mph is about £319 a van, £6,384 for the fleet. The full working is here.

Why does driver training fade?

Training depends on memory and effort, and both slip. A driver who sits through a session and promises to ease off still faces the same pressures afterwards: a late start, a full van, a customer waiting. Once the novelty and the feedback go, the old habit returns.

We do not have a published figure for how fast training fades, and we will not invent one. The pattern is well known to anyone who has run a programme. A new policy gets attention for a few weeks. Then it needs to be repeated, reported on and enforced, or it drops off.

That does not make training worthless. It does mean the policy should not rest on training alone.

What does a speed limiter do that training cannot?

It holds the setting on every journey, for every driver, without anyone having to remember. A speed limiter sets a maximum speed. The driver cannot exceed it, so the share of miles above the cap goes to zero.

A CE Delft study for Novem (March 2009) trialled limiters on 177 vans and 30 trucks of 3.5 to 12 tonnes in 16 companies for a year. The average fuel saving was 5%. That is a fleet average, including miles that never went near the cap.

A limiter does not teach smooth acceleration or stop idling. That is the division of labour: the limiter takes care of top speed, training and feedback take care of the rest. We compare the approaches side by side in speed limiter vs telematics vs driver training.

What should a fuel efficient driving policy include?

Short, specific rules the business can check. A workable structure:

• A speed rule per vehicle type, backed by a limiter where the vehicle allows.
• An idling rule, with a way of seeing idle time.
• A tyre and load check on a set schedule.
• A review cycle: fuel per vehicle, per route and per driver group, each month, with the same measure every time.
• A clear owner, usually the fleet or transport manager.

HGVs over 3.5 tonnes already have to be limited to 56 mph by law, and buses and coaches to 62 mph. Whether to cap your vans and cars is your decision.

Is there a result from a real fleet?

One published trial. Transport Engineer reported on 25 October 2012 that a utilities firm trialled AutoKontrol’s Rev.Control on 19 vehicles for six months. Fuel economy improved by 4.42 mpg, or 24.72%. The firm then ordered more than 300 units. The vehicles were panel vans, 3.5 tonne vans and tippers, and 4x4 pick-ups, most towing, and Rev.Control is a different product from a pure speed cap, so treat it as one data point.

Frequently Asked Questions

What are the best fuel efficient driving tips for fleets?

Cap top speed on fast roads, drive smoothly, stop idling, keep tyres at the right pressure, carry less and plan routes well. Speed is the one with published figures: a diesel van uses 14.5% less fuel per mile at 60 mph than at 68 mph (Department for Transport).

Does fuel efficient driving training work?

It can help while drivers apply it. Its weakness is that it relies on each driver, every journey. Pair it with measures that do not rely on memory, such as a speed limiter, and with regular feedback.

How do you enforce a fuel efficient driving policy?

You enforce what you can measure and control. A speed limiter enforces a top speed. Telematics reports idling and harsh driving so managers can have the conversation. Regular reviews of fuel per vehicle show whether it is working.

Is a speed limiter part of fuel efficient driving?

Yes, for the speed element. It does not replace smooth driving or idling control, but it removes the largest variable from the driver’s hands. The result for your fleet depends on how many of your miles are driven above the cap.

Who is responsible for fuel efficient driving in a fleet?

Normally the fleet or transport manager owns the policy, with drivers accountable to it. The finance lead sees the fuel line, so they need the same numbers.

Cut your fleet’s fuel bill

Find your own number with the speed and fuel calculator. Enter your vehicles, mileage and the share of miles above the speed you would cap at, and it shows the litres and pounds.

A speed cap saves most where a fleet drives fast. 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, and what reaches your bill depends on your share of fast miles.

Talk to us. AutoKontrol has made speed limiters in Britain since 1985, and our TrackSpeed device (see TrackSpeed) combines a speed limiter and GPS tracking in one installation, so you get the cap and the data together. Book a free consultation or get a quote.