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City Petrol contains 90% less sulphur, and is especially effective in reducing those compounds responsible for smog such as nitrogen oxide and reactive precursors
Premium unleaded is the name for normal 97RON petrol. City petrol is the slightly more ecologically friendly version that Tesco sell. As far as I know Tesco still do not sell Super Unleaded - I'd love to be wrong on this though.
Primium Unleaded and City Petrol are both 95 RON except city petrol is supposed to be better for the environment. Super Unleaded is 97 RON. I wouldn't even put City Petrol in my girlfriends Punto....
[This message has been edited by JoeyDeacon (edited 26 October 2000).]