Like Rusty mentioned, don't take notice of the US guys fuel ratings, it's RON vs. MON (google is good)
RON and MON, we use RON which is higher...
http://www.btinternet.com/~madmole/Reference/RONMONPON.html
RON MON PON
90 83 86.6
92 85 88.5
95 87 91
96 88 92
98 90 94
100 91.5 95.8
105 95 100
110 99 104.5
How many different brands of fuel do we really have here? I'm not talking about the stickers on the tankers, but where do they get their fuel from? Where do the storage depots get theirs from?
I've heard lot's of people dissing Optimax reckon it's crap, yet when my sister was working for Shell when it was released. Before they made it public, they were filling a select few servo's with it and not telling. She was receiving phone calls and letters / emails from people wanting to know what they did to their premium and please don't change it back, but still I hear how crap it is.
Don't fill up when a tanker has just filled the tanks until everything has had time to settle again either. Fill up at servo's with a high turnover too so there's less chance of getting stale fuel.