The bloke ahead of me at the petrol station was stood there with his receipt, shaking his head and glaring at the pump as if it had just sworn at him. He hadn’t brimmed the tank-just £20 of fuel-yet the total had raced upwards in seconds. Behind him, a short queue of drivers shuffled about, each doing the same quiet maths: “What has that quick run just cost me?”
Nobody kicked off, but you could feel the irritation hanging in the cold.
The little screen gives you a price per litre and a final total, but it rarely shows the one figure most of us actually care about: what this fuel costs me to cover a real distance compared with the alternatives.
From 12 March, that screen is going to start telling us a bit more.
From 12 March, petrol stations add a new line at the pump: price per 100 kilometres
From 12 March, petrol stations will be required to display a new, mandatory line of information directly at the pump: the price per 100 kilometres for each fuel type. Not just the familiar “£1.89 per litre” that many of us barely register any more-an actual, comparable number linked to how we drive.
In practical terms, it means you’ll be able to check-at a glance-what it costs to travel the same distance on petrol, diesel, or electricity (where the site also offers charging). This isn’t a tick-box label for officials; it’s a usable measuring stick for drivers who are fed up of guessing what’s genuinely cheaper.
Imagine a busy weekday evening: diesel and petrol nozzles on one side of the forecourt, and a small bay of fast chargers on the other with a couple of electric cars plugged in.
Up to now, comparing those options has been a headache for the average driver. A litre here, a kilowatt hour there, a membership fee on top, maybe a loyalty discount-working it out properly takes a calculator, a quiet moment, and patience. Realistically, hardly anyone does that every time they stop.
With the new requirement, you’ll see a simple line such as “Estimated cost per 100 km: £9.10”, based on standardised consumption data. Same distance, different energy source, and the comparison is readable on the spot.
The reasoning is straightforward: give motorists a way through a market that’s become increasingly complicated. Fuel choices have multiplied-E10, E85, B7, premium unleaded-and electric charging can vary wildly by speed, tariff, and provider.
Public authorities are trying to stop the conversation being only about litres and kilowatt-hours, and shift it to everyday reality: what does it cost me to drive from home to work and back? That’s the number that hits your bank account by the end of the month.
By requiring stations to show a comparable cost per 100 km, the rule doesn’t push you towards any particular choice. It simply gives you the tools to stop making decisions half-blind.
How to read the new £/100 km figure without tying yourself in knots
Your first reaction on 12 March will probably be curiosity. You pull in, pay, pick up the nozzle… and notice a new line or sticker on the display. Don’t just clock it and ignore it.
Treat the “£/100 km” figure as your anchor. If your vehicle can run on more than one fuel (for example, petrol and E85), this number shows-very plainly-what you’d expect to pay for the same journey. It won’t perfectly match your own driving, but it gives you a firm starting point.
It’s a bit like the energy rating label on a fridge: once it becomes familiar, you’ll wonder how you managed without it.
That said, there’s an easy mistake to make-assuming the figure is a personal invoice for your exact car. It isn’t.
The displayed cost per 100 km is calculated from standardised consumption, typically based on an “average” vehicle and official data. If you drive a heavy SUV, tow a trailer, or spend most of your time in stop-start city traffic, your real-world number will differ.
The right way to use it is as a comparison tool, not a guarantee. Compare fuel against fuel, station against station, and electric versus thermal-but keep a bit of margin in your head. Used that way, the label helps rather than disappoints you at the next refill.
A transport policy expert put it like this: “We’re not trying to predict every driver’s budget down to the penny. We’re giving everyone a shared language so they can compare like with like, not apples with kilowatt-hours.”
- Check the “£/100 km” line first
This is the quickest way to compare different fuels for the same distance. - Look at your own typical consumption next
If your car usually uses more than the “average”, mentally add a small buffer. - Compare stations along your regular routes
Over a month, even a few pence per 100 km can quietly add up. - Don’t ignore electric and alternative fuels
The new label might show that an option you’ve dismissed is actually cheaper for your mileage. - Take a photo once
It’s handy later at home when you’re thinking through commuting or weekend trips.
A quick way to make it more personal (without overcomplicating it)
If you know your typical fuel economy, you can sanity-check the label against your own driving. For petrol/diesel, you can compare the station’s £/100 km figure with what you usually spend based on your litres per 100 km (or by converting from mpg if that’s what your car displays). You don’t need perfection-just enough to understand whether you tend to sit above or below the standardised reference.
For electric charging, the same principle applies: your consumption (kWh/100 km) will swing with temperature, speed, tyre choice and heating use. The displayed figure is still useful for comparing tariffs, even if your winter number ends up higher.
A small label that could quietly shift our habits
A single extra line on a pump won’t bring prices down or make your commute shorter. But it may subtly change what we notice.
When the real cost per 100 km is staring back at you week after week, some journeys start to feel different. That “quick drive” becomes a visible budget line. Longer-term choices-moving to a more efficient vehicle, car sharing, or blending in public transport-feel more concrete when you can see what each 100 km costs you today.
Some drivers will take the new label as a nudge to change. Others will shrug and carry on, and that’s fine. The point isn’t to shame anyone; it’s to stop burying the true cost of mobility behind technical units and unclear pricing.
And for the people who swap tips with friends, family, or colleagues, the new mandatory display becomes an easy opener: “At my station it’s £8.50 per 100 km on this fuel-what’s it like where you are?” From there, the comparisons and small money-saving habits tend to follow.
One more thing worth remembering about savings
If the label prompts you to hunt for a lower £/100 km figure, don’t overlook the basics that affect consumption across any fuel type: correct tyre pressures, removing unnecessary roof boxes, and smoother acceleration. Those changes don’t alter the pump’s calculation, but they do reduce your real cost per 100 km-often more reliably than chasing a tiny price difference once a month.
| Key point | Detail | Value for the reader |
|---|---|---|
| New mandatory display | Cost per 100 km must appear at the pump from 12 March | Lets you compare fuels and energy types in a concrete way |
| Standardised reference | Based on average consumption and official data | Provides a shared benchmark, even if your own car differs |
| Everyday use | Check the label, then adjust for your driving habits | Better control of fuel spending and future mobility choices |
FAQ
Question 1 - What exactly must petrol stations display from 12 March?
They must show an estimated cost per 100 km for each fuel or energy type they sell, alongside the usual price per litre (or per kWh for charging).Question 2 - Is the new figure accurate for my specific car model?
Not exactly. It’s based on standardised consumption for an “average” vehicle, so your real cost may be higher or lower depending on your vehicle and driving style.Question 3 - Does this apply to all sites, including small rural stations?
Yes, it applies broadly to fuel retailers, although very small or special-case sites may be given a little more time to comply depending on national implementation.Question 4 - Will it genuinely help me choose between petrol, diesel, and electric?
Yes-because the options are expressed in the same unit, £/100 km, making it far easier to compare different energy sources for the same distance.Question 5 - What if the new information isn’t shown by 12 March?
Ask the operator about the change. If the lack of information persists, you can report non-compliance to the relevant consumer protection or competition authority in your country.
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