For the 300se W126, after a superb performance tuning, I switched to a higher octane unleaded (V-power @ Shell) from the Regular Unleaded - thinking there would be a big boost in power and performance.

I didnt think there was much improvement in the performance except where each refill was a little more costly. I was wondering if anyone has had any experiences from using a different fuel?

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... Kerry

126 tailed by a 203, 129 leading the pack.