Fuel guides
Plain-English answers on UK petrol and diesel: where the price comes from, what the grades mean, and how to pay less. Written by James Burfield and kept current.
When is the cheapest time to buy fuel?
You're looking for a trick. You're hoping there's a day of the week when petrol is cheaper. I get it. But here’s the truth: in the UK, the cheapest day to
Diesel grades explained: B7, premium diesel and HVO
B7 diesel is the standard grade you’ll find at most UK forecourts. It contains up to 7% biodiesel, made from used cooking oils and animal fats. This blend
E10 vs E5 petrol: the difference, and which to use
E10 and E5 are types of unleaded petrol. The numbers show how much ethanol is in the fuel. E10 has up to 10% ethanol, E5 up to 5%. Both are regular unleade
The Fuel Finder scheme, and why our prices are official
The Fuel Finder scheme is a statutory open-data initiative under the Motor Fuel Price (Open Data) Regulations 2025. It started on 2 February 2026. Every pe
Supermarket vs motorway fuel: why the gap is so big
169.4p is the average price for unleaded in the UK right now. But if you’ve ever filled up at a motorway service station, you’ll know it’s often a lot high
What makes up the price of a litre of fuel?
You pay for more than just the oil in your tank. Every time you fill up, your money splits into four parts: wholesale fuel, fuel duty, VAT, and the retaile
Why are fuel prices going up (and down)?
The UK average unleaded today is 169.4p and diesel 191.2p. That figure is the result of a chain of forces that few people think about. If you’ve filled you