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With those octane numbers you must be in either europe somewhere or Australia, which is confusing because your pic is of a left hand drive car!
Anyway, I think you will find that depending on the brand of fuel, you will find that most 95 fuels are rather optimistic in their claims, in reality a lot of 95 fuels are more like a solid 91-93 depending on brand.
Once you get to the new ultimate 98 fuels though it starts looking a lot better, they generaly are a much better product, with a good solid 95-98 actual rating depending on brand (the BP Ultimate here in Oz kicks ass).
Another benifit of the better fuels is that they have a higher percentage of cleaning agents in them, and so far I have noticed better running in every car I've used the stuff in.
It could be that the extra cleaning agents have cleared up a problem, or it could just be the extra octane, but it might not be the case.
Generaly you may want to check your exhaust oxygen sensor, and/or the knock sensor itself, and make sure your air filter is clean and that there is no flow restriction in the fuel line (dirty fuel filter), all of those things could be the cause of this, the car may have been running lean before and the extra octane stoped that.
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Veronica, my 85 760Ti
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