new shell optimax

[pc007]

hi chris
i had my car tuned by you here in canberra to 98 ron fuel. My question is i filled up my wife's car at shell and noticed that shell have their new replacement optimax out. Its 100 ron and has 5% ethanol in it. Is this ok to use on my xr6t or not. i was a bit worried about the 5% part and is it ok to use a higher ron fuel than the car has been tuned to. I always use 98 ron vortex.

peter