97 vs 99 ron - Mercedes Benz SLK Forum

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#1 Old 4 Weeks Ago
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97 vs 99 ron

With Mercedes recommending the SL is fed on 98 RON unleaded, my recent Scottish adventures were a good test to see if I could notice any change in performance between 97 and 99 octane fuel.
At home I have used Momentum 99 almost exclusively. Whilst in Scotland and for the journey home I was running Esso 97.
I was very surprised to find that I did notice a slight drop in performance with the Esso and a slight improvement when I filled up with Momentum back home. There was no noticeable difference in fuel economy.
There was a noticeable difference in cost my last 2 fill ups were almost exactly 63 litres. The Momentum was Ł12 cheaper.
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