Motorists who look after their cars’ engines may find their vehicles become more fuel-efficient, it has been claimed.

According to auto care group STP, certain treatments can cut petrol and diesel consumption by preventing harmful deposits from building up.

The company went on to say cleansing agents work by improving fuel flow to the engine.

It explained various deposits – such as dirt, varnish and gum – are "all too prevalent" in petrol and diesel and need to be removed.

The firm provides treatments for vehicles powered by both types of fuel and it claimed – when used as recommended – they add less than 3 pence per mile to the cost of a journey.

Additional benefits of the products include the fact they combat rust, cut exhaust emissions, minimise intake valve deposits and keep carburettors clean.

During winter, the petrol treatment also prevents fuel line freeze by getting rid of water in the combustion process.

In other engine-related news, Seat recently described the unit under the bonnet of the Leon Cupra R as "brutally powerful".

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