Date: Thu, 11 May 2006 16:45:03 GMT From: Johannes <johsnospam-spam-sizefitter.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. My 9000 2.0 LPT also runs better on Shell Optimax 97 or 98? Less likely to stall at full acceleration. These premium fuels also have cleaning agents which are beneficial.
