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Petrol is something millions of drivers around the UK rely on, but when faced with the choice of what to fill up with at the pumps, many wonder what is the difference between regular and premium unleaded?

That’s exactly what listener Irfan wanted to know, and if premium can really deliver on its promises to make your car more efficient, take you further, and clean out your engine for a higher price tag.

Greg Foot drives the investigation into unleaded petrol, what’s changed since we moved from E5 to E10 as our standard, what makes premium special, can it take you further, and whether our carbon footprint is better with one than the other?

PRESENTER: Greg Foot
PRODUCER: Kate Holdsworth