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Scam or saviour — do fuel-saving devices actually work?

With petrol and diesel prices at record levels, there is renewed interest in aftermarket “fuel-saving” devices and additives that claim to save you money at the fuel pumps.

A variety of aftermarket products — including fuel additives, magnets and airflow modifiers — claim improved fuel consumption and/or an increase in power. Some make bold claims about being able to save up to 17% on your fuel bills...

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