Northstar Gas Mileage

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Northstar Engines and System Technical Discussion Discussion, Northstar Gas Mileage in Cadillac Engine Technical Discussion; Anyone out there track their mileage on a 2003- 2005 DTS. Canadian RATINGS claim a 13.4/8 L/100 OR 21/35 MPG ...
  1. #1
    billybgont is offline Cadillac Owners Member
    Automobile(s): '03 Cadillac DTS
    Join Date
    Sep 2008
    Severn Falls, Ontario Canada

    Thumbs down Northstar Gas Mileage

    Anyone out there track their mileage on a 2003- 2005 DTS.
    Canadian RATINGS claim a 13.4/8 L/100 OR 21/35 MPG
    The best I can do is 10.9 if I drive it 95-100 and I jump to 14.5- 15 aqround 120 kph.
    If I put my foot into it and run 130 -135 kph it drops back down to 11.3 - 11.7.
    Input anyone.

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 F150 SuperCab 4x4
    Join Date
    Feb 2006
    MD Eastern Shore

    Re: Northstar Gas Mileage

    You should be getting close to double the mileage at 100kph.......but remember that the DTS has a final drive ratio of 3.71:1, so will get 2 - 4 mpg less than a base or DHS. Your engine should turn about 2100-2200 rpm @ 110kph +/-.

    Remove the engine cover and pull the vacuum line off the fuel pressure regulator (FPR) located on the (looking at the engine) right rear of the fuel rail. Is there any gas in the line or in the nipple on the FPR ? If there is, easy fix from or parts at Lindsay Cadillac, Luke, parts, ------> over there.

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