My own personal findings in a standard un re-mapped T5 which are in no way "law" are: Sometimes I get a tank of rubbish at Summerfield and Asda petrol stations, poor running and lumpy acceleration. Sometimes in rural areas I don’t have a choice of petrol stations when I need fuel. In theory its the same fuel with different additives!
Shell premium works best for me. Shell Vpower/optimax did not justify the extra price for the very, very little pmg gain. (I know if you have a remap you should always run it on 98+ Ron to get full power.)
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