Your van almost certainly returns less than its official fuel economy figure, and that is normal rather than a fault. The official number comes from a standardised laboratory test on an unloaded vehicle at steady speeds, and a working van is none of those things — it is loaded, it stops constantly, it idles, and it is shaped like a wardrobe. The gap is usually widest in urban multi-drop work and narrowest on a steady motorway run. What you can control is not the gap but the habits, and a handful of them are worth real money.
We sell used vans in Haydock, St Helens, and get asked this more than almost anything else. These guides sit under our Van Guides hub, alongside Van Running Costs.
Why your van never returns its official figure
Four reasons, and none of them is anybody misleading you.
- The test is standardised; your week is not. Official figures exist so two vans can be compared on the same basis, not so you can budget from them. A ruler, not a forecast.
- The test vehicle is empty. Yours is not. Weight costs fuel every time you accelerate, and a van carrying a day’s materials is carrying it all day.
- A van is a bad shape. A tall, flat-fronted box pushes a lot of air, and the cost of that rises steeply with speed. Add a roof rack, a ladder or a light bar and it rises again.
- Stop-start work is the worst case. Every set of lights is fuel spent getting the mass moving again, and a cold engine on a short run never reaches the temperature at which it is efficient.
The practical version: treat the official figure as a comparison between vans and your own measured figure as the truth about yours.
How to measure your van’s real economy
The trip computer is a guide, not a measurement. Most read optimistically, and the error is not consistent between vans, so comparing two vans by their dashboards proves very little.
Do it brim to brim instead. Fill until the pump clicks off, reset the trip meter, drive a full tank of the work you actually do, then fill to the click again at the same pump. The fuel that went in against the miles on the trip meter is your real figure. One tank is a snapshot; three across different weeks is a number you can plan with.
Keep two things constant: the same pump, because cut-off points differ, and roughly the same load. To skip the arithmetic, the apps van drivers actually use covers the ones that log fill-ups and work it out for you.
If you are self-employed and claiming for the mileage rather than the fuel, the arithmetic changes shape entirely. The government’s simplified expenses checker will tell you which method is better for your situation, and HMRC’s advisory fuel rates are the reference if a company vehicle is involved.
What actually costs you fuel in a working van
In rough order of how much difference each one makes.
- Speed. The biggest lever on a van, because air resistance climbs sharply and a van has a lot of frontal area to push. A few miles an hour off a motorway run is the most reliable saving there is.
- Weight you are not using. Tools you no longer need, materials from last week, a half-full water tank. It costs fuel every time you pull away, all day, every day.
- Anything on the roof. A roof rack or ladder rack is a permanent penalty whether or not there is anything on it. If it comes off for the winter, take it off.
- Tyre pressures. Underinflated tyres cost fuel and wear out faster, and a van’s correct pressures are usually different laden and unladen — the plate in the door tells you both. This is the least costly saving on the list and the most commonly ignored.
- Idling. A stationary engine returns nothing at all. Modern stop-start does this for you; on an older van it is a habit you have to build.
- Short cold trips. An engine that never warms up is inefficient the whole way, and hard on the exhaust system with it.
Servicing belongs on the list too. A clogged air filter, tired oil and a neglected particulate filter all cost fuel before they cost anything else — part of why a van with a full service history is worth more than one without.
Payload versus economy: the trade-off you cannot avoid
The honest answer to “which van gives me the most payload without hurting economy” is that no van escapes the trade-off — but the choice that matters is not the engine, it is buying the right size in the first place.
A medium van worked near its capacity is generally more economical than a large one worked half empty, because you are not carrying the empty box around all week. The mistake that costs most fuel is buying a size up “just in case” and never using it. The opposite mistake costs more than fuel: an overloaded van is illegal, wears out faster and stops worse.
More than three-quarters of everything we sell is a small or medium van. That is not us steering people down; it is what the work actually needs once somebody has measured the biggest thing they carry regularly rather than the biggest thing they carried once.
Which size that is, is a whole question of its own — choosing the right van takes it apart by size, body and load length.
The changes that pay for themselves, and the ones that do not
Pay for themselves, quickly: correct tyre pressures checked weekly; taking the roof rack off when it is not earning; emptying the van of what you are not using; servicing on schedule; and easing off the speed on long runs. All of those are free or nearly free, and together they are worth more than anything you can buy.
Sometimes worth it: lower-rolling-resistance tyres if you are replacing them anyway, cruise control on a van that has it, and planning routes to avoid the worst stop-start — which saves time as well.
Do not bother: the aftermarket fuel-saving devices, magnets, additives and chips that promise a big improvement for a small outlay. If a manufacturer could get that gain from a bolt-on part, it would already be fitted. Practical ways to cut fuel use on a working van goes through the ones that genuinely work, and wider fuel-saving advice for van drivers covers the driving side in more detail than this page can.
Does the engine size or the van size matter more?
Van size, almost always. Two vans of different sizes with the same engine return noticeably different figures, because the bigger one is heavier and pushes more air. Two vans of the same size with different engines are usually far closer than the specification suggests — a larger engine working easily can beat a small one working hard, especially loaded and uphill.
Gearing matters more than most buyers expect, too. A van geared for motorway cruising and one geared for pulling away with a load behave very differently over a week — neither is wrong, they are set up for different work.
None of that is worth guessing at model level, because the model-by-model figures are properly answered elsewhere: Trafic against Vivaro and Transit against Transit Custom against Connect compare like with like.
Buying for economy: what to look at instead of the mpg claim
An advert’s economy figure is the least useful number on it, because it is the laboratory figure and every van gets one. Four things tell you more.
- Service history. A van serviced on schedule is running as it should; one that has not is quietly costing fuel before it costs anything else.
- Tyres. Matched, legal, correctly inflated and not perished. Mismatched tyres on a van are a sign of what else was done cheaply.
- The MOT record. Free, instant and honest about how the van has actually been kept — what vans fail their MOT on covers what to look for in the advisories.
- Whether the size is right for your work. The one decision that outweighs everything else on this page.
One thing worth knowing before you buy: most vans are taxed at a flat commercial rate rather than on emissions, so a more economical van does not automatically cost less to tax. The government’s vehicle tax rate tables have the current position.
Common questions
Why does my van use more fuel than the official figure says?
Because the official figure comes from a standardised test on an empty vehicle at steady speeds, and your van is loaded, stopping constantly and shaped like a box. The gap is widest in urban stop-start work and narrowest on a steady motorway run. Treat the figure as a way of comparing vans, not as a forecast.
Which van gives the most payload without hurting fuel economy?
No van escapes the trade-off, so the question to answer first is size rather than engine. A medium van worked near its capacity usually beats a large one worked half empty, because you are not carrying the empty box around. Buying a size up “just in case” is the choice that costs the most fuel.
How do I work out my van’s real fuel economy?
Brim to brim. Fill until the pump clicks off, reset the trip meter, drive a normal tankful of your usual work, then fill to the click at the same pump. Divide the miles by the fuel that went in. One tank is a snapshot; three across different weeks is a figure you can budget from.
Do fuel-saving devices and additives work?
Not enough to be worth the money. If a bolt-on part delivered a large gain, manufacturers would already fit it. The savings that are real are unglamorous: correct tyre pressures, less weight, no roof rack when it is not earning, servicing on schedule, and a few miles an hour off on long runs.
Does a bigger engine always use more fuel?
No. Two vans of the same size with different engines are usually closer than the specification suggests, and a slightly larger engine working easily can beat a small one working hard — especially loaded and uphill. Van size and weight make far more difference to a week’s fuel bill than engine capacity does.
Looking for something more economical than what you have? See what we have in stock now — and if the size is the real question, choosing the right van is the better place to start than any economy figure.