Ok Gents, looking for advice.

My RS250 is set up for Avgas, which is ok for UK use but cant seem to find a reasonable way of getting hold if it if i want to do a European track day.

Hence, will probably be converting it to unleaded fuel.

Question is ....

I take it the Elf MITS42 is unleaded but high octane for better performance over say Shell Optimax, but how much more performance are we going to get between the two fuels.

Also, if the bike was to be converted for pump fuel, would the head volumes etc still be ok with MITS42?

Any advice greatfully appreciated.