My friends father is a HGV driver, delivers fuels, mainly heating oil.
The reason I mention this is because he told me about "Cracking", a controversial way of producing fuel that results in diesel/petrol with a very low cetane number/RON that is most often sold by supermarkets. The better fuels, higher cetane/RON, distilled from crude are usually snapped up by the big brands, BP, Shell etc..
The cracked and crude are often mixed to varying degree's and sold as mixes but again the lower cetane/RON stuff is brought then sold by supermarkets.
Testing a fuels cetane number is a difficult process so lower than the EU standard(51) is often sold to the public as additives such as cetane boosters are expensive.
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