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Date: Wed, 10 May 2006 14:22:43 -0400
From: Fred W <Malt_Houndnospamm-me-not*yahoo.com>
Subject: Re: Regular gas in a 9.5?


Pooh Bear wrote: > > Fred W wrote: > > >>Richard Sutherland-Smith wrote: >> >>>>From there on out, you should probably use 89 octane in a linear. >>>>There is no such thing as "90" octane in the US. It is 87 (regular), 89 >>>>(mid-grade) and 91 to 93 (super/premium) depending on location. The >>>>small difference between the gas certified to be 89 (or better) and 90 >>>>is pretty insignificant. If you wanted to be anal about it you could >>>>squirt in a few gallons of premium fuel every tankful of mid-grade, but >>>>since the mid grade is at least 89 (most likely somewhat more) it is not >>>>a very big deal. >>> >>> >>>Interesting, ain't it, our petrols over here are all unleaded and are >>>91, 96 and 98 octanes. My 9000 Aero likes 98 as recommended, but this >>>is not available everywhere, so it usually runs happily on 96. >> >>Ricky, >> >>Your talking RON, and we rebel yanks are talking PON (Pump Octane >>Numbers) which is RON+MON/2. So your 96 is our 89. But I'm not >>entirely sure of the happiness of my SAAB's engine either way... >> >>What is perhaps of interest (and maybe this was the point of you post) >>is that the bigger gap is between your "low grade" and your mid-grade. >>Why anyone would pay a big premium for 2 points of octane is a >>reasonable question. > > > In the UK many places only sell 95 RON ( e.g. supermarkets ) with an > alternative 'superunleaded' being 97-98. > > 95 is fine for most cars but some perfromance vehicles get some extra > performance from 97/98. > > I'm puzzled by your suggestion that 96RON = 89PON. This table suggest more like > 92PON. > http://www.btinternet.com/~madmole/Reference/RONMONPON.html > > That also makes 95RON ( which I normally buy ) equal to 91PON which makes sense > to me for use in a Saab. > > Graham > Right you are... 96 RON should be about the same as 91 PON (aka AKI) -- -Fred W

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