HDDP (or other 100 Octane users), just wanted to ask how much of a difference 100 Octane made, and what the difference was, also what's you normal fuel?

Also do you know the composition of the fuel ie how the 100 Octane is reached in terms of additive.

I think BP Ultimate in the UK forecourts is 98 Octane, I think it came in when F1 were made to use fuel very similar to road fuel. 98 seems to be the highest available outside of tracks, forecourts used to have 5 star which was 100 Octane leaded fuel.

Malcolm