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That's interesting.
The reason I ran for a month on each is that I put in half a tankful each week so that by week 3 I should be running fully on the higher rated stuff.
As I said, the 95 stuff is giving a better MPG than the 97 but I'm going to do the same again shortly as I suspect the engine was tight initially.
I'm also concious that the ECU adapts itself but it does take time.
I've heard that if you are intending to change the RON rating that you should reset the ECU ?
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