1999 deville North** lost mileage
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Northstar Engines and System Technical Discussion Discussion, 1999 deville North** lost mileage in Cadillac Engine Technical Discussion; went from 28-29mpg @ 68 mph, hwy driving to 24, 25. Engine runs great. Also, temp in summer reaches as ...
  1. #1
    Dick is offline Cadillac Owners Member
    Join Date
    May 2006
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    1999 deville North** lost mileage

    went from 28-29mpg @ 68 mph, hwy driving to

    24, 25. Engine runs great. Also, temp in summer reaches as high as 215 degrees is that ok?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 1999 deville North** lost mileage

    215 is normal. Check the FPR for the milage drop. See the Tech Tips section for a "How To" (very easy).

  4. #3
    eldorado1 is offline Cadillac Owners Connoisseur
    Join Date
    Feb 2004
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    FL
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    Re: 1999 deville North** lost mileage

    I've never had over 25ish mpg highway...

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