Date: Tue, 09 May 2006 18:59:12 -0400 From: Fred W <Malt_Houndnospamm-me-not*yahoo.com> Subject: Re: Regular gas in a 9.5?
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. Here, the smaller gap which is between the low and mid grades (87 - 89) costs about 10 cents per gallon, and for another 10 centavos you get the big jump to 93 (4 points more) -- -Fred W
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