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Date: Sat, 22 Oct 2005 20:20:56 GMT
From: Johannes <johsnospamh-spam-izefitter.com>
Subject: Re: Premium vs. regular unleaded?


"Charles C." wrote: > > Gary Fritz wrote: > > I've been wondering this for a while, but I didn't want to enter that > > Australian-argument thread, so here's a Saab-only question: > > > > What would happen if I ran my 2002 9-5 Aero on regular unleaded, instead of > > premium? > > I did check this on a 1997 9000 (2.0 lpt) and found the consumption to > have been better by 8% or by 4-5% (I guess it might have depended on > what I did with each tankful). From memory my calculation at the time > was that at 4-5% better consumption it evened(?) out the price > difference .... etc. > > I stayed with premium fuel because I "honestly" thought the car run > smoother at around the 3rd tank. (Could it be that I felt what I wanted > to feel? Who knows who cares.) I've always felt that my 1993 9000 2.0 lpt ran better on premium, but since this thread came up, I've been more careful with my observations. I'm now convinced that premium fuel prevents the fuel cut-off at the end of a maximum acceleration run on a particular stretch of road. This tends to happen when using regular fuel, presumably by the anti-knock mechanism in combination with a reluctant wastegate. But much less of a problem with premium.

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