Petrol up by 1.55p and diesel by nearly 1p – 3% fall in the value of pound could hurt drivers if oil goes up.
After a month of falling fuel prices in June, July saw both petrol and diesel rise once again as the pound lost 3% on the dollar, data from RAC Fuel Watch* reveals.
Luckily though, pump prices are still cheaper than they were at the start of June as only 1.55p went on to the average price of unleaded during the month taking a litre to 129.21p (in June petrol fell 3p a litre to 127.62p).
Diesel was slightly less affected, going up by a penny (0.93p) to 131.95p (in June diesel reduced by 4.6p to 130.90p).
This means a tank of petrol now sets drivers back £71.07 compared to £70.21 at the end of June. For diesel the difference is just 51p with a complete fill-up increasing to £72.57.
At the four big supermarkets the fuel price rise was steeper with 1.88p being added to petrol, taking their average price to 125.95p. Diesel went up 1.64p, making a litre cost 128.62p.
Wholesale prices rose as a result of oil enduring a mid-month boost, hitting a high of $67.41 on 10 July but falling away to $63.97 by the close.
The other oil price-defining factor – the strength of sterling – took a dip following the change of Prime Minister, with the pound dropping 3% from $1.26 at the start of July to $1.22 by the close.
In fact, the pound reached its lowest level against the dollar ($1.2152 on 30 July) since March 2017 ($1.2151 on 9 March 2017).
Motorists will undoubtedly feel the pinch at the pumps if the pound remains this weak and oil were to rise to around $70 a barrel.
- Petrol and diesel prices | RAC Fuel Watch
- How to save fuel - the ultimate guide
- What is the best fuel for my car? The definitive guide to different fuel types
RAC fuel spokesman Simon Williams said: “Sadly, July saw a return to rising pump prices making the respite of June all too brief.
"While there were only relatively small rises in both petrol and diesel, the situation might have been far worse if the drop in the value of the pound had combined with the higher mid-month oil prices.
And, of course this could still very easily prove to be the case if the pound doesn’t recover in the next few weeks.
“The price of a barrel of oil has been fluctuating between $60 and $70 since the end of May as traders can’t seem to be able to get a clear understanding of what’s happening with global demand.
"On the one hand there is talk of an economic slowdown in China and, on the other, concerns about supply due to the tanker hijacking issues in the Strait of Hormuz through which a third of the world’s sea-borne oil supply is shipped.
“Drivers can only hope we don’t see the nasty combination of a rising oil price and a falling pound.
If we do, August could prove to be a very costly month on the UK’s roads.
This could easily lead to petrol going above the 2019 high of 130.67p seen at the start of June and diesel exceeding the year’s high point of 135.54p at the end of May.”
Motorists can keep abreast of the latest fuel prices by visiting the RAC Fuel Watch webpage.

Is it illegal to drive without shoes?
Get the answer and more useful driving content sent straight to your inbox.
You might also like

How to save fuel – the ultimate guide
8 industry-expert tips for how to save fuel: looking at cruise control, the speed you drive, what gear you drive in and how much fuel you carry

What is the best fuel for my car? The definitive guide to different fuel types
To help you understand what fuel you should be putting into your car, here’s our simple guide to fuels in the UK and across Europe.

What is WLTP? Worldwide emissions and fuel consumption test explained
WLTP is the latest fuel economy and emissions testing regime designed to be more realistic than the old system. Read our in-depth explainer guide here.

Crit'Air clean air stickers – your guide for driving in France
With the law change in Paris and France we explain what the 'Crit'Air' clean air stickers are, where they're used, how to get one and what happens if you don't

Driving habits that damage your car
A list of 10 things that could be damaging your vehicle – and you might not even realise you’re doing them. Learn more here with the RAC.
Popular in News
1
Car buyers to save thousands as EV grant returns
2
Private parking companies issue a record 14.4m tickets to drivers in a single year
3
Drivers fined £1m from just 36 yellow box junctions in 2024
4
Road deaths on the rise in Great Britain
5
Private parking industry urged to publish ‘full and transparent’ complaints and appeals data
6
Drivers now able to search for new home that comes with EV chargers
7
Leicester’s Sean Kimberlin named as RAC Mobile Mechanic of the Year
8
Number of drivers caught using unroadworthy vehicles jumps by 52% in a year
9
Warning to drivers across the UK over fake parking apps
10