What type of diesel fuel?

[Poodle]

the higher end fuels probably ARE the same, or very very similar generic product from a quality section of the refinery.. as they wont sell it in anywhere near the quantities needed to make it as a custom bespoke product..

i cant see that being the case (as has been stated) for cheap fuel variants as  there will almost certainly be volumes of better quality for the "premium" suppliers and the cheap and nasty stuff for margin worried people like supermarkets..


interestingly however Texaco seems to be most expensive by me,    there is texaco a refinery/fuel depot in Cardiff bay docks

It's all about the additives, on the basis of your argument margarines are all the same because they're based on the same ingredients. It's not a "bespoke" product because it's not tailored to an individual buyer, it's a captive mass market ffs, it doesn't come and less "custom, bespoke" than that. They sell plenty of premium at enough of a premium (no pun intended) to make it worth the r&d, i've seen premium fuel sold at as much as 35ppl more than normal fuel. To give you half an idea, when i was working at a fuel station premium fuels accounted for about 1/4 of the total volume of fuel sold. And the people who buy the most? Typically middle-aged people who do moon miles in their personal vehicles and so have the opportunity to notice the difference. Had a bloke in the office last week who claimed to have gained more than 20% mpg, a smoother engine and, so far, 42,000 more miles from the engine itself compared to the last, which was run on normal pump fuel - identical engine, no other differences in maintenance, etc, nothing else to which the massive change could be attributed. Funniest thing was he is still a sceptic and a bit miffed that we couldn't offer any other explanation as to where the extra power, economy and longevity had come from lol.