hi all, now ive been using shell v power ever since i brought the 200 last july and im not fussed on petrol prices so was wondering would there be any difference if i change to lets say tesco momentum or bp ultimate? what is the octane rating rating of these? i just fancy a change and ive always had to travel about 8 miles to get the v power when theres a tescos round the corner. just want to see what people are using really and have anyone noticed any differnce in performace or mpg. cheers