Unfortunately this is a reprocussion from tuning up your car, you need to run it on higher octane fuel. Also, GTT arent the only company who reccommend this, basically all the tuners out there advise that you use high octane fuel after you increase your cars performance. I believe that even the
JCW Cooper S is supposed to be run on premium fuel, but I could be wrong on that, although Im sure I remember seeing a thread on it a while ago...
Its a shame you live so far from a petrol station with that good fuel, but I suppose that it sort of the price you pay for having a tuned up car - but Im sure the new found speed more than makes up for that inconvenience, although I can understand what you are saying as it can be a little annoying especially when you are paying £1+ a litre nowadays for premium fuel
