[Tatsfield]

I use supermarket diesel almost exclusively however on one occasion I had to fill up on Shell and I chose VPower because it was available and my supermarkets don't sell any upgraded diesels so I thought I'd see what it did. And I found that the car seemed more responsive. This could be placebo effect and since I'm not prepared to pay the extra I went back to the cheap stuff so my experience isn't conclusive except that the VPower didn't cause any problems and that wasn't placebo.

I've come across this fuel /performance allegation on other car forums and there is never a conclusive outcome. I've now fitted the Polestar optimisation and even the cheap fuel pushes the car into the sound barrier (exaggeration!)