There is a knock sensor the KV6, however their is much debate on if it advances and well as retards timing. I do not know the definitive answer, it would seem pointless to not advance as 95 ron is our standard fuel and I would see little point in retarding only as we have good fuel in the UK.
What I would add is that as far I as I have been able to establish shell V power is the only fuel now to contain no added bio elements, there is a move in the eco warrior lobbists to get higher and higher amounts added to our fuel. V power is also the only fuel that is processed by shell in there own refinery other fuel comes from a common refinery with propitiatory additives mixed in at the refinery before delivery to the company. I use v power unless there is a silly offer on fuel at tesco/morrisons/sainsburys.
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