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Originally Posted by simply_sunny001  System G is meant only to be used with Normal petrol not with Premium petrol. |
This is correct. The Ford Fiesta manual recommends use of System G with normal unleaded fuel of 91 octane, not premium petrol. Shell normal and IOC normal are 91 Octane fuels. I've never used premium fuel on my Fiesta so far, but my mileage is always 11 to 12 in Hyd.