Petrol Prices UK 2026: A 4-Week Plan Before the Duty Rise

October 24, 2026

Petrol prices UK 2026 4-week plan – golden fuel flowing into an hourglass on a London rooftop

The 4-Week Plan · UK fuel · Starts Monday 26 October 2026

Petrol averaged 174.57p a litre across the UK in the week of 19 October 2026 and diesel 199.33p – that's 39.9p and 56.5p more than a year ago. Fuel duty is scheduled to rise 3p on 1 January 2027 and another 2p on 1 March. This plan gives you four weeks, one small action a day, to cut your fuel bill before those rises arrive.

£96.01

A 55-litre tank of petrol now (it was £74.08 in October 2025)

+39.6%

Rise in the average diesel price in 12 months

+6p

Per litre by 1 March 2027 from duty plus VAT, if rates go ahead

Those are the official numbers: the government's weekly road fuel prices (Department for Energy Security and Net Zero, published 20 October 2026). The ONS says motor fuel prices were up 29.8% in the year to September, the main reason UK inflation jumped to 3.5% – we unpacked that in what September's inflation jump costs your household.

Here's the uncomfortable truth: you can't change the pump price. You can change three things – where you buy, how you drive, and how many miles you need – and together they're worth hundreds of pounds a year for an ordinary driver. The plan below runs from Monday 26 October to Sunday 22 November, so it's done well before the January duty change.

What a year of fuel costs you now (and cost a year ago)

We ran the official prices through three typical mileages. Petrol assumes a car doing 40 miles per gallon; diesel assumes 50 mpg. A UK gallon is 4.546 litres.

Miles a year	Petrol now	Petrol Oct 2025	Diesel now	Diesel Oct 2025
5,000	£992 (£83/month)	£765	£906 (£76/month)	£649
7,000	£1,389 (£116/month)	£1,072	£1,269 (£106/month)	£909
10,000	£1,984 (£165/month)	£1,531	£1,812 (£151/month)	£1,298

Our calculation using DESNZ weekly pump prices for w/c 19 October 2026 (174.57p petrol, 199.33p diesel) and w/c 20 October 2025 (134.69p, 142.81p). Illustrative; your mpg and mileage will differ.

At 7,000 miles in a 40 mpg petrol car, the year-on-year difference is about £317. In a diesel at the same mileage, it's about £360. That's the hole this plan is trying to fill.

The fuel duty timeline: dates to put in your diary

28 Oct 2026

Autumn Budget. HMRC says the government will confirm final fuel duty rates at Budget 2026. Our Budget rumours vs reality piece separates what's already set from what's speculation.

18 Nov 2026

October inflation figures from the ONS – the next official read on how far fuel is pushing up prices.

31 Dec 2026

The 5p cut ends. The temporary cut that has held duty at 52.95p since March 2022 was extended from 31 August to 31 December 2026 (HMRC, May 2026).

1 Jan 2027

Duty to 55.95p (+3p). With 20% VAT on top, that's about 3.6p a litre, or £1.98 more per 55-litre tank.

1 Mar 2027

Duty back to 57.95p (+2p more). Total rise about 6p a litre including VAT: £3.30 more per tank, or roughly £48 a year at 7,000 miles and 40 mpg – if pump prices otherwise stay put.

The duty rise is a few pounds a tank. The habits below are worth far more – which is exactly why they're worth four weeks of your attention.

The 4-week plan, day by day

Each week has one theme and seven micro-actions. None takes more than 10 minutes. Do them in order; the first week gives you the baseline every later saving is measured against.

WEEK 1 · 26 OCT – 1 NOV
Measure: find your real pence per mile

Mon: Fill the tank to full and note the odometer reading.
Tue: Look up your last three months of fuel spending in your banking app. Write the monthly average down.
Wed: Check your tyre pressures against the figure in your handbook or door sill. The Energy Saving Trust recommends checking at least once a month and before long journeys.
Thu: Clear the boot of anything you don't need this week. Weight costs fuel.
Fri: List your regular trips (work, school, shops, care visits) and the miles for each.
Sat: Note which of those trips could be combined, shared, walked or moved to a quieter time.
Sun: Fill up again. Litres used × price ÷ miles driven = your pence per mile. At today's prices a 40 mpg petrol car runs at about 19.8p a mile; a 50 mpg diesel about 18.1p.

WEEK 2 · 2 – 8 NOV
Price: stop paying the convenience premium

Mon: Install a price-comparison app or site that uses the government's Fuel Finder data. Since the scheme went live on 2 February 2026, retailers must report price changes within 30 minutes (Fleet World, 2026).
Tue: Find the three cheapest forecourts within five minutes of your usual routes. The CMA's market study estimated drivers could save up to £4.50 a tank by shopping around within a five-minute drive (CMA road fuel annual report, December 2025).
Wed: Compare supermarket and non-supermarket prices near you. In the week to 18 October, supermarket petrol averaged 2.6p a litre less than other stations (Fuel Finder open data, compiled by fuel-finder.uk).
Thu: Plan never to fill up on a motorway unless you must. The same data showed a 20p-a-litre motorway premium – about £11 on a 55-litre fill.
Fri: Decide your "fill trigger": top up when you pass your cheapest forecourt with a quarter tank left, not when the warning light forces you to the nearest pump.
Sat: Check your loyalty points or cashback balances and whether they actually beat a cheaper independent forecourt.
Sun: Log this week's litres, price paid and miles in the tracker below.

A short pause for the money side. Fuel is a spending category that can quietly double without anyone deciding it should. If you'd like a structure for the next month, the 30-Day No-Spend Challenge & Budget Tracker pairs nicely with this plan: essentials like fuel stay in, everything optional gets a pause, and you see where the money you saved went. If money worries make it hard to open the banking app at all, the free 7-Day Money Anxiety Reset journal is a gentler first week.

WEEK 3 · 9 – 15 NOV
Drive: squeeze more miles from every litre

Mon: Change up early. The Energy Saving Trust suggests changing gear at around 2,000rpm when accelerating.
Tue: Look further ahead and ease off early for lights and queues instead of braking late.
Wed: Switch off the engine if you'll be stationary for more than a minute (if the car doesn't do it for you).
Thu: Ease off on faster roads. The Energy Saving Trust notes fuel use rises sharply at high speed.
Fri: Around town, open a window rather than running the air con; the EST says it's more fuel efficient at low speeds.
Sat: Remove roof bars or a roof box if they're not in use – they add drag every mile.
Sun: Fill up and recalculate your pence per mile. Compare it with Week 1.

WEEK 4 · 16 – 22 NOV
Cut and claim: fewer miles, money back

Mon: Combine two errands into one loop. Short cold-engine trips are the least efficient miles you drive.
Tue: Ask about a lift share for one regular trip – school run, club, or a shared shift.
Wed: If you use your own car for work (not commuting), check what your employer pays per mile. HMRC's approved rate rose to 55p a mile for the first 10,000 business miles in 2026–27, up from 45p (GOV.UK).
Thu: If they pay less than that, you can claim tax relief on the difference for this year and the four previous tax years. Keep a log of dates, miles and reasons.
Fri: Look at your online shopping: one larger order beats three drives to the shops.
Sat: Set a monthly fuel budget for December–March based on your new pence per mile, plus 6p a litre from March.
Sun: Final fill-up and final calculation. Write down your saving.

Your printable fuel tracker

Print or copy · Fuel tracker · 26 Oct – 22 Nov 2026

Week	Litres	Price/litre	£ spent	Miles	Pence/mile
1 · Measure
2 · Price
3 · Drive
4 · Cut & claim

Pence per mile = (£ spent × 100) ÷ miles. My Week 1 baseline: ______p · My Week 4 result: ______p

What the four weeks can be worth

We modelled one illustrative driver: 7,000 miles a year, a 40 mpg petrol car, paying today's average 174.57p. Her annual fuel bill is about £1,389. Here's what each habit is worth if she keeps it up for a year.

Drive 10% fewer miles (700 a year) · ≈ £139

Avoid one motorway fill a month (20p/litre premium) · ≈ £132

Improve mpg by 10% through Week 3 habits · ≈ £126

Buy at the cheaper supermarket price (2.6p/litre) · ≈ £21

Cost of the duty rise from March (6p/litre) · ≈ −£48

The savings don't simply add up – fewer miles means fewer litres to save on – but the direction is clear: the first two lines alone outweigh the duty rise several times over. And notice which ones are biggest. They aren't the hypermiling tricks; they're the boring decisions about where and how often.

Checkpoints: are you on track?

Checkpoint	On track if…	If not
End of Week 1	You know your pence per mile and monthly fuel average	Use your last two receipts and odometer guess – rough is fine
End of Week 2	Your price per litre is below the UK average in the latest DESNZ figures	Widen your search to a 10-minute radius on routes you already drive
End of Week 3	Pence per mile is lower than Week 1 at a similar price	Recheck tyre pressure and roof clutter; pick one habit, not five
End of Week 4	You have a December–March fuel budget and, if relevant, a mileage log	Set the budget at your Week 4 pence per mile × expected miles

If fuel is one of several bills you're struggling with, free help exists. Citizens Advice can help you prioritise bills and check benefits, and MoneyHelper offers free, impartial budgeting tools. Heating is the other winter pressure – see our Warm Home Discount 2026 guide and the full UK money calendar to January 2027.

Quick answers: petrol prices UK

When does fuel duty go up in 2027?
Under HMRC's current schedule, from 52.95p to 55.95p a litre on 1 January 2027 and to 57.95p on 1 March 2027. The government says it will confirm final rates at the Budget on 28 October.

How much is a full tank of petrol in the UK?
At the 19 October 2026 average of 174.57p, a 55-litre tank costs about £96. The same tank of diesel at 199.33p costs about £110.

Is supermarket petrol cheaper?
On average, yes – 2.6p a litre in the week to 18 October 2026 – but the biggest gap is between motorway services and everywhere else, about 20p a litre. A local independent can still beat a supermarket, which is why comparing live prices matters.

Can I claim tax relief for fuel?
Only for business journeys in your own vehicle, not ordinary commuting. If your employer pays less than HMRC's approved 55p a mile (first 10,000 miles, 2026–27), you can claim relief on the difference.

Driving in another country? Our Australian petrol toolkit and US fuel budget plan apply the same logic with local prices.

Your next step

Turn the four weeks into a month you can see.

The 30-Day No-Spend Challenge & Budget Tracker is a 100% digital printable PDF. Nothing physical is shipped and there are no shipping fees – you download it right after purchase, then print it or fill it in on your phone, tablet or computer. It's a one-time purchase.

→ Get the 30-Day No-Spend Challenge & Budget Tracker
→ Or start free with the 7-Day Money Anxiety Reset journal