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  1. #1
    Kev

    Join Date
    07 Nov 2013
    Location
    Worthing
    Posts
    1
    Saab(s)
    900s Auto
    Thumbs Up:   0

    Low MPG ???

    Hi all. I have just purchased a 900s 2ltr Auto convertable.

    I am only getting an average of about 15 or less MPG.

    is this normal?

    Thanks

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  2. #2
    Mike
    Moderator Shazam's Avatar
    Join Date
    30 Jul 2010
    Location
    Rochester, New York, USA
    Posts
    1,987
    Saab(s)
    Saab-less
    Thumbs Up:   1
    Is this in town or highway? I had a 900 2.0t for years. In town, if I drove it enthusiastically, I was always around 15mpg. If I drove a bit more cautiously, I would typically be about 17mpg in town.On the highway I was typically around 25~26mpg if I drove it around 70mph. If I went up to ~72mph it would drop to about 23~24mpg. If I was willing to drive at 65mph, I could get 28mpg.

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  3. #3
    Chris Campbell
    Saab addict
    Join Date
    18 Mar 2012
    Location
    Portland, Maine
    Posts
    3
    Saab(s)
    '02 9-5 Aero JZW Stage 5+, '99 9-3 Turbo, '95 900SE Turbo Convertible, '95 900S Convertible
    Thumbs Up:   0
    Quote Originally Posted by Kev McCarthy View Post
    Hi all. I have just purchased a 900s 2ltr Auto convertable.

    I am only getting an average of about 15 or less MPG.

    is this normal?
    Thanks
    Nope, not normal. I've always averaged mid-high twenties in mixed driving in my NG900 'vert and OG9-3. I used to get 1-2mpg less on the 9-3 since it was an auto (5-spd conversion underway). I'd start with simple stuff, front 02 sensor (you can splice a generic one in from eBay for cheap), tire pressure, etc... Have you actually calculated your gas mileage? Or are you just going off of what it says on the SID? Are you getting any CELs? Does it seem to be running particularly rich (exhaust smells like gas/sometimes dark smoke if it's running pig rich)?

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  4. #4
    Dave T.
    Super Moderator Dave T's Avatar
    Join Date
    03 Aug 2010
    Location
    near Seattle, Washington
    Posts
    1,468
    Saab(s)
    1999 9-3SE (2013-2015), 2005 9-3 (2005-2013), 1990 900 (1990-2003)
    Thumbs Up:   32
    Imperial gallon, which is larger?

    1990 900 (non-turbo) approx. 18-28 mpg, average 22
    1999 9-3, approx 20-26, average 23
    2005 9-3, approx 20-35, average 26

    This is my experience, measured in US gallons. If the filters and oil is old, change it. Also check tyres. All of these steps probably won't solve the problem.

    Oh, I had a Saab automatic, which got about 1 mpg less.

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  5. #5
    Saab Fan
    Join Date
    05 Jan 2014
    Location
    Seattle
    Posts
    14
    Saab(s)
    '08 9-7x
    Thumbs Up:   0
    I'm interested in hearing a more complete answer to this question. My recently purchased 900 2.0L got about 20 MPG on the first full tank I gave it, which was less than I hoped for for mixed highway/town driving. Anyone know what changes will actually improve mileage? The tires are fine (just put new ones on); will new plugs or wires make a measurable difference? Anything else?

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  6. #6
    Saab Fan
    Join Date
    14 Mar 2011
    Posts
    26
    Thumbs Up:   0
    Check the tire pressures if you don't already; just because the tires are new doesn't mean they are inflated properly. Spark plugs could be involved, so you may want to pull them to inspect the gap and general condition (the correct gap is listed on a placard above the radiator, I believe). There are no wires per se, instead a coil-on-plug system is used (DI cassette). These can and do go bad after a while, but often will set a code when there is a problem.

    Short trips in cold weather are horrible for mileage as well, since fuel economy is poor before the engine and catalyst are up to temperature.

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  7. #7
    Saab Addict
    Join Date
    10 Mar 2011
    Location
    new jersey usa
    Posts
    832
    Saab(s)
    08/280/xwd & 09/210/xwd
    Thumbs Up:   0
    This is a US based site so it would be nice if you did the conversions instead of the other way around. Worthing in Nebraska or UK and how about mileage. It's the little things that make a difference.

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    Semper ubi sububi in caput tuum

  8. #8
    Frank
    Administrator nordwulf's Avatar
    Join Date
    30 Jul 2010
    Location
    USA - Netherlands
    Posts
    7,873
    Saab(s)
    previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
    Thumbs Up:   132
    Off-topic discussion moved here: http://saabworld.net/f16/us-global-site-29689/

    It looks like the OP has not been back since he started this thread. British MPG are usually higher numbers than US MPG. 15 MPG UK is 12.5 MPG US. Both are pretty bad numbers for a Saab 900.

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  9. #9
    George McKinnon
    Engine Guy George McKinnon's Avatar
    Join Date
    20 Jan 2014
    Location
    Dayton, Nevada
    Posts
    9
    Saab(s)
    1995 Saab 900SE convertible
    Thumbs Up:   0
    I am an independent mechanic, specializing in engine rebuilds. I find that engines more than fifteen years old or with high mileage (relative to the number of cylinders) suffer from dried and cracked valve stem seals. Of course some are worse than others depending on the overall climate in your area, how often your car has overheated or at least gotten close to overheating etc. I am publishing an article in the Saab tech area that explains this problem in more detail.

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