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  1. #1
    Saab Enthusiast
    Join Date
    15 Apr 2012
    Location
    spokane, wa, usa
    Posts
    89
    Saab(s)
    '95 9000 Aero, '98 9000 CSE, '05 9-5, '11 9-4X
    Thumbs Up:   1

    Recommended tire pressure PSI versus MPH

    My wife's XWD 3.0 has the 18" tires and a recommended pressure of 35 PSI. When we picked up the car at Ken Garff's in Salt Lake City, it had 34 PSI and got 21.5 MPG on the first road trip back to Spokane.

    This time, same stretch of I-84 through Idaho and Utah, but loaded heavier, I increased the tire pressure to 39 PSI. At a cruise-controlled 78 MPH, the mileage was 24. This included climbing several 5500' mountain grades at 4200 RPMs.

    The higher pressure does not noticeably detract from the highway ride. On Spokane's bomb-cratered streets, I'll go back to 35 PSI.

    jack vines

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  2. #2
    Dave T.
    Super Moderator Dave T's Avatar
    Join Date
    03 Aug 2010
    Location
    near Seattle, Washington
    Posts
    1,353
    Saab(s)
    1999 9-3SE (2013-2015), 2005 9-3 (2005-2013), 1990 900 (1990-2003)
    Thumbs Up:   26
    Recommended tire pressure is not gospel. Mercedes Benz summed it up nicely. In their owner's manual, they said to use 3 psi more pressure than the tire pressure on the door sticker for better gas mileage and better handling at the expense of worse ride. In other words, they said you could choose. That is the only car company that is so frank with the subject.

    Since I now have a number, I apply that to my Saab. I put 3 psi more than on the door sticker. In fact, in the winter when it is cold and wet, I put 4 psi more. That usually means that I don't have to put air in the winter tires because they are on only about 3 months and might lose 2-3 psi during this time.

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  3. #3
    Frank
    Administrator
    Join Date
    30 Jul 2010
    Location
    USA - Netherlands
    Posts
    7,789
    Saab(s)
    previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
    Thumbs Up:   111
    Was it the same stretch of highway in the same direction? I think new engines generally have higher fuel consumption in the beginning but perhaps that's just a myth.

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  4. #4
    Saab Enthusiast
    Join Date
    15 Apr 2012
    Location
    spokane, wa, usa
    Posts
    89
    Saab(s)
    '95 9000 Aero, '98 9000 CSE, '05 9-5, '11 9-4X
    Thumbs Up:   1
    Yes, same stretch of highway in the same direction. The car was a demo and had about 3,000 miles on it when we bought it.

    jack vines

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  5. #5
    Saab Enthusiast
    Join Date
    26 Dec 2011
    Location
    Russia
    Posts
    168
    Saab(s)
    88' 9000 2.0i, 05' 9-5 Aero 345HP, 11' 9-4X Aero Hirsch
    Thumbs Up:   0
    I use 38 PSI since it is told in the book to have such pressure if you drive faster thatn 160km/h............ But stock tires is pure shit. change it as soon as poosible to something with Y or at least W rating.

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