The real reason Asda, Tesco and Sainsbury's fuel is cheaper - and no, it's not 'watered down'

Tesco and Asda have confirmed rules allowing drivers to save up to £8 on a tank of fuel, providing essential relief as pump prices reach record levels. Additionally, Asda, Tesco, Sainsbury's, and Morrisons frequently offer fuel at prices up to 10p per litre cheaper than those of major brands. This pricing difference has prompted public questions, although reports clarify the reasons behind the lower costs offered by these specific supermarket chains for their customers.