After reading this, I was curious as to what the octane rating of standard unleaded petrol was over here, so I looked. Whilst I didn't find the right answer* (it's either 91 or 95, depending on who you ask), I did find something that was interesting and may clear up some misunderstanding in this (and other) threads:
There are a number of different octane ratings for petrol including RON (Research Octane Number) and RON (Road Octane Number). That's right, cats, there are 2 RONs used for measuring octane. The latter RON (Road) is 4-5 points less than the Research Octane Number so that 92 Research would be 87/88 Road. The quoted rating is also a minimum figure.
The question is: are you all using the same ratings?
*It did answer my question, after all!!
