-------------- Original message --------------
From: "Steve B." <Imperial59@xxxxxxxxxxxxxxx>
> >I just have to jump in when I saw those figures about octane ratings...
> >I always wonder why gasoline in the US is so cheap whe you compare it with
> >the price in my country.
> >Gasoline will cost three times as much overhere, you see.
> I lifted this from about.com
> Gasoline pumps typically post octane numbers as an average of two different
> values. Often you may see the octane rating quoted as (R+M)/2. One value is
> the research octane number (RON), which is determined with a test engine
> running at a low speed of 600 rpm. The other value is the motor octane
> number (MON), which is determined with a test engine running at a higher
> speed of 900 rpm. If, for example, a gasoline has an RON of 98 and a MON of
> 90, then the posted octane number would be the average of the two values or
> I think the difference you are seeing between your octane numbers an the
> ones used in the USA are just different ways of calculating the octane.
> Steve B.
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