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Row over quality of super fuels
independent testing by leading compar perfor mance experts has been done on multiple cars over tens of thousands of miles and shows that tesco's super unleaded 99 octane gives better fuel economy and better performance than other unleaded fuels, a spokesman said .
cutting emissions which? also tested a diesel super fuels brand said that bp ultimate diesel made the fuel economy and perfor performance of a renault megazine 1.5 slightly worse .
it is simply not possible to obtain a reliable comparison of the fuels based on short term tests with one or two vehicles as indicated by the which? testing, he said .
but a spokesman for shell said: shell v-power can help keep new cars performing like new for longer, and in some cases can help rejuvenate older cars .
there is no conclusive evidence to shows that super fuels are better for your car in the long run .