Google Maps Shows Live Fuel Prices: Is the Cheapest Pump Worth the Detour?

Saving 5p a litre sounds like an easy win. On a 50 litre fill, it saves £2.50. But if reaching the cheaper petrol station adds mileage and takes you away from paid work, that saving can disappear before you reach the pump.

Google Maps now gives UK drivers another way to compare fuel prices. For small businesses that travel to customers, the useful question is whether the cheaper station fits the working day.

What changed on Google Maps?

On 8 October 2026, the government announced that Google Maps had started displaying near real time UK petrol and diesel prices using Fuel Finder data. The database was already available through services including Waze, PetrolPrices and RAC Fuel Watch. The new development puts that information into another widely used journey planning app.

The government says the system represents approximately 99% of fuel sold on UK roads. That is a measure of fuel sales coverage, not a promise that every displayed price will be correct when you arrive. Its estimated £40 annual saving relates to households with a car, rather than a guaranteed saving for each business. Read the original government announcement.

Fuel retailers have been required to report price changes within 30 minutes since February. The official Fuel Finder guidance explains the service. Near real time information still leaves room for reporting and display delays, so check the price at the forecourt before filling.

Calculate the saving before making the detour

Start with a simple calculation:

Gross pump saving = litres purchased × price difference per litre.

If you buy 50 litres at a station charging 5p less, the saving is 50 × £0.05 = £2.50. This is the maximum extra journey cost you could absorb before the saving disappears. It is not yet your net saving.

Next, subtract the additional fuel consumed, any relevant vehicle wear and the value of time spent on the detour. Measure the extra distance compared with the journey you would otherwise make, including any return journey.

An example where cheaper fuel costs more

Consider these illustrative assumptions. They are not current market prices or figures taken from a client:

• You buy 50 litres and save 5p per litre.
• The cheaper station adds six miles to your planned route.
• Your vehicle achieves 40 miles per UK imperial gallon.
• Fuel costs £1.75 per litre for the calculation.
• The detour takes 15 minutes, valued at £15 per hour.

The extra six miles consume approximately 0.68 litres, costing £1.19. Fifteen minutes at £15 per hour adds £3.75. Together, that is approximately £4.94 of additional cost against a £2.50 pump saving.

You are about £2.44 worse off before allowing for additional vehicle wear.

There is an important distinction here. Valuing time at £15 per hour does not mean every spare quarter hour creates a £3.75 cash loss. If the detour replaces unpaid idle time and affects no other work, its immediate financial cost may be lower. If it delays an appointment, creates paid overtime or displaces productive work, the time matters much more. Avoid counting the same time twice as both paid labour and lost contribution.

If the cheaper station is already on your route, the calculation changes. There may be very little extra cost, making the saving worthwhile. Likewise, a larger fill or a bigger price difference can justify a modest detour.

What this means for a mobile service business

Building Mobile Massage Oxfordshire from one practitioner into a network of 19 therapists across four counties has made travel an important part of how I think about service delivery. Appointment locations, availability and the distance between bookings all belong in the operational decision.

The wider lesson applies to cleaners, tradespeople and other businesses visiting customers. A booking can look attractive when you consider its selling price alone. Once you include travel, administration and delivery time, the margin may be much smaller.

This is one reason more sales can leave a small business with less money. Cheaper fuel helps, but it cannot compensate indefinitely for journeys that the price of the work does not cover.

Five practical changes to make

1. Compare stations when planning the route. Look for suitable stops along journeys already required. Make the comparison before driving or while safely parked.
2. Set a sensible detour limit. Calculate the saving for the amount you expect to buy, then compare it with extra mileage and time. A fixed rule such as “always use the cheapest station” ignores those costs.
3. Group appointments geographically. Where customers have flexibility, offer appointment windows that allow nearby jobs to be completed together. Account for service commitments and realistic travel buffers.
4. Record travel against the work. For a representative period, track extra mileage, travel time and the contribution left after delivery costs. Use your own vehicle costs rather than assuming a tax mileage allowance is an exact measure of operating cost.
5. Review persistent losses. Where particular journeys repeatedly leave too little margin, consider a clearly explained travel charge, minimum booking value or different coverage arrangements. Honour existing agreements and communicate changes before customers book.

If you use a fuel card, compare the price you actually pay under the agreement, including relevant fees and restrictions. The advertised pump price may not be your effective price. Keep comparisons on a consistent basis.

My view: make fuel buying part of the working day

Google Maps fuel prices are useful because they make a small operational decision easier. The best result comes from combining the information with sensible scheduling and a clear understanding of delivery costs.

I would begin by checking stations on existing routes and reviewing the jobs that generate the most travelling time. Those two actions can reveal whether the next improvement should come from buying fuel, arranging work differently or reviewing a price.

For help examining those decisions, explore Skills 2 Grow operations and process improvement support. You can also read the Mobile Massage Oxfordshire growth case study.

By Julian Frincu. Published 8 October 2026. Launch information is attributed to the Department for Energy Security and Net Zero and HM Treasury. The financial example is illustrative; the operational recommendations are the author’s analysis.