A CU2 is designed to run on 95RON fuel, there is very little, if any gain running 98. That is my experience after trying both.
As for fuel consumption improving with more KMS, Rubbish. Since my 2nd tank of fuel I have always recorded under 8L/100k & that is over 30,000km & 18 months. I keep a spreadsheet on all fuel used to I have accurate figures from the day the car was purchased.




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