08-30-2006, 06:09 AM
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The Devil's in the detail
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Real Name: David
Location: Melbourne, Australia
Hybrids: 2008 Toyota Prius
Posts: 145
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Re: US Octane Rating
I'm currently using 91RON, which as I understand it is about 87-88PON (which as I also understand is a combination of RON and MON).
The next option we have here is 95RON then 98RON and now 99RON.
Once again, as I understand it, the RON / MON rating has little to do with extra power (as we are all being told it does in Aus) but more to do on how much compresson the fuel can take before it pre-ignites. ie. 98RON can run in higher compresson engines without "knocking".
Has anyone tried a higher RON / MON / PON fuel, and was there any noticable difference in FE?
On another point. I have noticed my FE improve markedly since -
1/ I hit 14,000 KLM's
2/ I increased tyre pressure to 44psi
But I still can't crack 60mpg....what the hell are you guys doing to get that high?
The combined FE rating in Aus is 4.6L per 100klm.
Which equals 50mpg using the US gallon = 3.785 litres?
Now 4.6L/100klm is a very hard figure to get to. I mean REALLY hard.
You do have hills over there...don't you???
Where am I going wrong?
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