Hi,
I was wondering if any of you guys have tried, seen or have opinion on the latest performance GAS... from Shell - Australia.

Should I use; 100 octane ... "Shell-Optimax-Extreme".
I mean... is the ethanol additive - safe and OK to use in the Crossfire?
Cost is AUD $1.25 /Litre.

http://www.shell.com/home/Framework?...r_extreme.html

OR

Should I use; 98 octane... "Shell-Optimax".

http://www.shell.com/home/Framework?...t_ga_1602.html

Cost is AUD $1.15 /Litre.

OR

Should I use; 95 octane... "Shell-Premium Unleaded".

http://www.shell.com/home/Framework?...pulp_0323.html

Cost is AUD $1.05 /Litre.

All help much appreciated...