A cleaner form of petrol is being introduced at filling stations across Wales from today.

E10 petrol, which is made with up to 10 per cent bioethanol – a type of renewable fuel – will be the standard offering at forecourts as part of UK government plans to cut carbon emissions.

It is replacing E5 petrol, which was blended with up to 5 per cent bioethanol.

The UK's Department for Transport (DfT) said more than 95 per cent of petrol cars licensed for use on Britain’s roads would be compatible with E10.

But that still leaves around 600,000 cars – such as classic cars or those built in the early 2000s – incompatible with the new fuel, according to an impact assessment published last January.

Owners of those vehicles can continue to access E5 by purchasing super unleaded, which costs an average of 8.7p a litre more than standard petrol, according to AA figures.

Drivers can use the UK government’s online E10 checker to find out if their vehicle can be filled with E10.

The DfT admitted that E10 could “marginally” reduce fuel economy, but it insisted the impact is “almost unnoticeable to most drivers when making every day journeys”.

It stated that the rollout of E10 could cut transport CO2 emissions by 750,000 tonnes per year, which is the equivalent of taking 350,000 cars off of UK roads.

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UK transport secretary Grant Shapps said the rollout of E10 would be "so important" for climate targets.

“Although more and more drivers are switching to electric, there are steps we can take today to reduce emissions from the millions of vehicles already on our roads," he added.

“The small switch to E10 petrol will reduce greenhouse gas emissions as we accelerate towards a greener transport future.”

From today, E10 will be available across Wales, England and Scotland, and will be introduced in Northern Ireland early next year.

AA president Edmund King called its rollout "a positive and simple step to help reduce the carbon impact from road transport".

An RAC survey of 1,450 UK drivers suggested that 27 per cent of motorists are yet to check whether their car is compatible with the new fuel.

The firm’s head of policy Nicholas Lyes said: “E10 petrol has already started appearing on forecourts to replace the old E5 blend, and that process will continue at pace in the coming weeks.

“But while the vast majority of drivers of petrol cars aren’t affected, a sizeable minority will be and the only way to be sure is to use the official online checker.”

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