I normally run 95 in mine.... a big problem in Sydney as everyone is ditching the 95 in favor of E10. Higher octane fuels do not generally improve preformance however I beleive (feel free to disagree everyone) that the quality control is higher on premium products so I'm less likely to get a tank full of below spec product
E10 is a mix of RON 92 and ethanol alcohol. The blend gives an octane rating of 95 however....
Ethanol burns faster than petrol so you get less klms than straight 95 from a tank.
Ethanol absorbes water so if your local servo doesnt undertake good housekeeping you will end up with water in your tank.
The most important thing is to get your fuel from a republe source... major oil company owned sites are best as they are less likely to add any "fuel extenders", have good housekeeping policies and are more likely to look after you if it goes pear shaped.
By 2012 the government will most likely mandate it's use in all products and we wont have a choice. I think this is already the case in Europe
