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I don't find a difference in smoothness, but I get much better fuel consumption on 97 Octane fuel as against 95 Octane. 97 is about 5 to 8 pence a litre dearer than 95 for me. They have 98 in continental Europe and it's pretty much the same price as 95 (unless I'm being dumb with the currency change, not unknown).
My manual warns me to go gently if using anything less than 95 and not to use less than 91.
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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190
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