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Date: Mon, 24 Jan 2000 13:25:43 -0800
From: haysco.nospamnopsamyon.com (Bill Hays)
Subject: Re: Regular or Premium in 2.3T?


I've had the same experience as Julie, also in a '91 9000 2.3l turbo -- lesser grades (below 92 octane) won't ping or knock, thanks to the anti-knock circuitry, but my gas mileage with, say, 89 octane (I've never tried 87 octane) is about 2-3 mpg less in my daily driving (a mix of neighborhood, densely urban and freeway driving in the Seattle area) and noticeably reduced performance. The 2-3 mpg decrease in mileage offsets any price gain (about $0.10 to $0.15 per gallon) from the lower octane fuel. The lesson: stay with the premium gas -- better mileage, better performance, lower cost per gallon. B. In article <388BDC77.348D1C33nopsamerfs.berkeley.edu>, "Eugene C. Palmer" <eugpnopsamerfs.berkeley.edu> wrote: > Julie Wardell wrote: > > > > my rule of thumb, use the lowest octane fuel which doesn't produce a > > knocking sound in the engine. also, if it feels better to drive after a > > certain fuel grade is put in, then stick with it. > > > > Julie > > Hali and Eugene <halieugnopsam.com> wrote in message > > news:388B6C1D.CC429424nopsam.com... > > > What experience do 9-5 2.3T owners have with using mid and low grade > > > (89-87 octane) fuels in the 2.3T engine. What does the manual specify? > > > Consumers reports state it requires premium, but the actual SAAB spec is > > > hard to find. > > > > > > Thanks > > > -- > > > EugP > > > Berkeley, CA > > OK, so I understand the theories about using premium if it knocks, but > I'm curious about if anyone has actually USED regular. SAAB Specs via > the SAABNET site: http://www.saabnet.com/tsn/models/2000/ts95w.html > state "87-93 RON" for both the 2.3T and 3.0T. Electronically controlled > engines these days won't actually knock because of the knock sensors and > controlled timing. A SAAB salesman said they could use regular. The > SAABNET site appears to back these up. The question I have is what are > the real world effects from real owners who have climbed hills, pounded > the pedal, heated the engine UP and taken MPG measurements and FELT the > power comparisons between regular and premium on tanks that were filled > with more than 70-90% different grades of gasoline. Is there a > significant difference in MPG and power due to the presumably retarded > timing on 87-89 octane regular? Of course most people who shell it out > for a SAAB aren't likely to skimp on the gas and even buy regular unless > they had no other choice. I'm wondering if there is anyone who has > actually done so. > > Thanks, > > EugP > Berkeley, CA

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