been running mine on super unleaded for last 6 months and i get about an extra 40 miles out of it i will not go back to 95 now even if super leaded helps or not
oh and got 161 bhp on dyno yesterday so i think it does a little 
You've probably got the extra miles from the air temperature decrease.
Shell v maxx super unleaded will give you 3/5bhp over a basic supermarket normal unleaded.
Is it worth the extra pennies on a daily? no not at all.
Does it make your engine run better? No again.
Its a way of getting more money out of us punters
