The go with the fuel was touched on in the earlier post.
98 RON does help stop the onset of detonation in a turbocharged car.
Bare with me here guys as I am not a Lab Tech.
With normally aspriated cars the use of normal premium is fine and the use of 98 Octane products is a personal choice.
But with a car running forced induction, a better burning fuel as well as a fuel that combusts better under load is prefered. While under load a 98 Octane fuel actually burns better / or for a better wording explodes in a more prefered manner.
*Taken from the Web*
*If you are running too low of an octane for your motor, you will get
pinging. Pinging in its extreme form is also known as detonation. The
fuel/air mixture is igniting all at once and exploding instead of igniting
as a flame wave. The resultant "bang" is very hard on the pistons, head,
rods, and cranks.*
I have been using BP Ultimate while I have been here in QLD, but while I was in Sydney i was using Mobil Synergy 8000, both fuels out perform the shell product in my opinion.
Hope this helps.... I am sure it is as clear as mud!
Mike