I mostly use Sainsbury's because it's cheaper and I often do my weekly food shop there. Funnily enough, my current next preference is Esso and I understand their super unleaded is supposed to still be ethanol free. I think I get slightly more MPG from the real Esso petrol but I've not measured it conclusively.
I also occasionally use Shell and Tesco but not often enough to have an opinion.
I never use BP after getting a dodgy tankful from them once which caused all sorts of problems including lighting the lambda lamp.
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