It is interesting... Owned my scooby for 3 years now, used 97RON for the 1st 8 months and then moved to Momentum. The difference was really noticeable to me. When I had a decat & remap, the mechanic told me to change to BP ultimate before the mapper came down; so I ran the tank down and made the switch.

She felt like a shaddow of her former self, had the remap and ran with the new map for 100 miles or so, she warmed into the map but frankly I was expecting a bit more power.

One day I was on auto pilot and pulled into Tescos without thinking and filled her up. After a day or so she was back with vengence!!

Obviously everyone's gonna have an opinion on this as did my mechanic (and he does know his stuff) but it's Momentum all the way for me peeps.