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Cadillac XTS Forum Discussion, Mpg in Current Cadillac Vehicle Discussion; I use a nifty little program called Fuelly. www.fuelly.com . I never partially fill the tank and have done 4 ...
  1. #16
    flying fossil is offline Cadillac Owners Member
    Automobile(s): Kinda Red XTS Premium
    Join Date
    Oct 2012
    Location
    Irvine, CA
    Posts
    76

    Re: Mpg

    I use a nifty little program called Fuelly. www.fuelly.com.
    I never partially fill the tank and have done 4 fill ups and 1113 miles.

    24.1
    23.5
    24.7
    22.7

    All of my mileage is about 65% freeway and these number relect that. My best is 24.7 and avg. is 23.7
    I am always on cruise on the freeway at approx 72mph, climate control on at 72 deg.

    It tracks fuel prices, avg. price, cost/mile and other little things.

    http://www.fuelly.com/dashboard/

    Good news is that it's free.

  2. #17
    Dramset is offline Cadillac Owners Member
    Join Date
    Dec 2012
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    Reno, NV
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    32

    Re: Mpg

    My point was that different pumps will shut off at different points in the fillup, so "filling your tank" at Pump A probably won't match "filling your tank" at Pump B.

  3. #18
    thebigjimsho's Avatar
    thebigjimsho is offline Cadillac Owners 10000+ Posts
    Automobile(s): ZIP
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    Jun 2004
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    In the barrel of a gun...
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    49,300
    Who stops when the pump does?

  4. #19
    b4z
    b4z is offline Cadillac Owners Connoisseur
    Automobile(s): 2014 Standard SrX grey/black
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    Chas. SC
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    Re: Mpg

    My Cts gained 2-4 mpg on the hwy once the engine got about 4000 miles on it. Xts should be the same.

  5. #20
    ra0007 is offline Cadillac Owners Member
    Automobile(s): XTS
    Join Date
    Nov 2012
    Posts
    24

    Re: Mpg

    OK, just finished 700 mile trip, ave speed 61.7 mph( mostly insterstate) and best ave mpg was 21.7. I have never seen the kind of mileage described on the sticker 17-26 and definitely not the 29 mpg describe in earlier posts. XTS Platinum AWD (appx 3000 miles on car) is not living up to expectations. "04 Seville with NorthStar was much better ( consistently 24-26+ on highway).

  6. #21
    BreakThrough's Avatar
    BreakThrough is offline Cadillac Owners Fanatic
    Automobile(s): 2011 CTS-V Coupe White, 2014 XTSV-Sport Black
    Join Date
    Jan 2004
    Location
    Portland, Oregon
    Posts
    186
    Recent trip 400 miles. 3 passengers and luggage. Mostly hi way miles, avg mpg was 22.9. My XTS is AWD and currently has approx. 4000 miles.

  7. #22
    ral1960 is offline Cadillac Owners Fanatic
    Automobile(s): 2008 DTS Perf-Plat, fr 11 STS, 04 DeV, 76 Eldo Con, 74 Fltwd
    Join Date
    Jan 2005
    Location
    NC
    Posts
    435

    Re: Mpg

    On the roundtrip to my brother's in CT, most of it on I-81, I consistently got ~2 mpg better going North, in two different cars and even in winter, when I thought the wind was against me. Must have something to do with the shape of the hills.

    It does look like my LLT V6 STS gets worse mileage than my DeVille did, but it's so hard to drive it slow and easy. Either you get bogged down in 6th at 1200 rpm or you want to accelerate and downshift and watch the instantaneous mpg drop to single digits. Is the XTS like that?

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