I changed my fuel last week now its getting a bit dryer and tried optimax. Filled the tank and didn't think I would feel any difference. I was wrong.
I can definatly feel the power difference and my mpg has also increased. I did a average mpg reset on the motorway and it jumped to 30 mpg at 60mph. It started to drop over a few miles and settled on 21.9
I have left the average reset alone and after half a tank I am on 19.8mpg. I have not used p500 yet.
Optimax it is for me from now on.!!!!
30 mpg? 21.9 mpg? 19.8 mpg? Is that metric or something? My average since I got the car is 10 mpg, although that's mostly city driving.