Hey. I have travelled 2000 miles in the 5 weeks since I took delivery of my Cayman. The mpg is not great. I hope that it may still improve. I was told by the dealer to use "Super" unleaded (here in the UK that means 97 octane, I think?!) which is quite a bit more expensive that conventional premium unleaded (which I think is 95 octane). I was wondering, what do you guys use? Should I strictly use Super, or alternate with Premium?