Quote:
Originally Posted by glang
hmmm I think if that was the case the car manufacturers would have to give varying engine power outputs and speed figures for different octane fuels and Ive never seen that.....
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They specify engine power at their recommended octane, this varies across the world - in parts of Asia lower octane may be the norm, while in Europe 95 is standard. I have tried it in our cars and they are deffo smoother and perkier on 97 or 99 and the extra MPG can make it just about financially OK to pay the extra.