I don't know about adelaide, but in melb most brand named servos will have
98 octane.  All will have premium unleaded but that is only 95 octane. 
Try all different ones in your car to see which works best.  Mobil's 98 fuel seems to work the best in my car.

for all who didnt get here in time, this is what stotty posted before i shunned him and he edited his post:lol:

stotty's question

"hey,

im looking at a wrx or a NA currently going through all the pros and cons, down to the very fine details....

i was wondering how many 98 octane (cause its not ideal to run a turbo on 95 is it??) fuels there are in adel? what are the best ones you believe through use, price, efficency? and where they are available??? i live a henley beach and dont fancy driving ages for fuel....

i pulled this from another forum >> BP Ultimate/Shell Optimax - 98 Octane, is this true???

its all a bit confusing for me lol, as there seems to be a ever increasing number of fuel names out there.

cheers for all help and advice"

Run 98 even if its an NA, for a couple of bucks extra you get cleaner fuel and better economy, and fill up at BP cause they are the best, end of thread.

vortex from caltex is no longer 98 only 98 so watch out for that one. stick to bp.
its always a bit more but at least u know its quality.

**** sorry its olny 95 i was using it in my old mans classic car as it needs hi octane to not ruin the heads and we asked the attendant and they told us its only 95.

walts22;180116 wrote:

Run 98 even if its an NA, for a couple of bucks extra you get cleaner fuel and better economy, and fill up at BP cause they are the best, end of thread.

Bp rocks my jocks when it comes to fuel however BP 95 octane feels to suit my NA ej22. Don't fill up when it is hot you will get reemed about 5 percent or so volume wise (heat expands petrol!), when you are paying a premium price you want a good return.

I normaly fill up with BP ultimate, but this time i needed fuel really quickly and i filled up with mobil 8000 (98 octane) and it seems to be alright, very similar feel to BP.