Best MPG you've observed
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Best MPG you've observed in Past Cadillac Vehicle Discussion; Hi everybody. We have a 2004 Seville and we have taken it on trips but the best MPG we got ...
  1. #1
    capthead is offline Cadillac Owners Member
    Automobile(s): 2004 Seville
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    Best MPG you've observed

    Hi everybody. We have a 2004 Seville and we have taken it on trips but the best MPG we got was 23 and change. We drive 70-80 on freeways and are using regular, not premium.

    My previous car was a RWD Pontiac Formula with a supercharged and modified LT1 with 500 HP and I could get 24.8 doing 120 mph. So, if the common knowledge is FWD is more efficient and HP used more fuel, why doesn't this Cadillac get better mileage?

    I drove my Pontiac from Las Vegas to LA one Christmas morning at dawn which was a Sunday also and no traffic. 2000 RPM was 80 and 3000 rpm 120 I nade the trip in record time and filled each end to ck mileage. Even at 80 I got 25 MPG.

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  3. #2
    wlewis is offline Cadillac Owners Member
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    Seems low. I average little over 23 on my daily commute a 14 mile drive of mostly 45mph and a portion of downtown city blocks. I believe my last highway trip was 29 or 30 mpg at 70 to 75 mph with 87 octane.

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    25 MPG @ 80 MPH, and only .2 MPG at 120 MPH (double the speed limit on Christmas morning, nice...), with a supercharged V8? .....No, not even if your Pontiac was a super light, hyper aerodynamic prototype.

    Long trip, level ground, consistent legal speeds, ~26-28MPG in an SLS.

  5. #4
    Zynder is offline Cadillac Owners Member
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    Re: Best MPG you've observed

    1992 Seville STS 4.9L -----> 21.9 mpg as read by the dash computer, usually stays around 20.5 on mixed driving and I drive like I stole it!

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Best MPG you've observed

    2002 STS, 7 round trips to Florida and back - Shell 87 (higher octanes make absolutely no difference - tried everything except snake oils), 24.8 mpg at I-95 speeds - which vary between 60 and 80 depending on state/traffic, plus the off-ramp to motels and food/fillups figured into the average - using a hand calculator and the onboard calculator.

    A SLS or ESC in good condition will easily log 26+ mpg under those conditions ^^^.

    As always, mpg depends on weather, load, mechanical condition, tires, and black magic. To help long run highway mpg a tad, carry 32 - 34 psi (cold) in the tires.

    BEST observed ??? 25.3 mpg, 56 miles at a purposeful 55 mph.

  7. #6
    consigliori's Avatar
    consigliori is offline Cadillac Owners Fanatic
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    27mpg on straight thru 1400 mile trips to Montana, all highway premium fuel

    I think I get around 17-19 most of the time, mixed city & highway I guess

  8. #7
    ben.gators is offline Cadillac Owners Connoisseur
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    Re: Best MPG you've observed

    You didn't mention that your Seville is STS or SLS. But because it is '04, and assuming that you live in the US, I am going to say it is a SLS. 23MPG on highway isn't very out of line. Actually the estimated highway gas mileage for SLS is around 26-28, I think!
    Based on my personal experience with my STS, which has a worse gas mileage compared to your SLS, if i keep a setady speed of 65-70 MPH, I can easilly get 24MPG. But in a packed highway, where I need to brake, accelerate, and pass other cars, 20 MPG is what I get. City is a totally different story! Right now my average MPG is around 10! My daily commute is one mile per way, and there are more than 10 stop signs and traffic lights combined between my house and my work!

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Best MPG you've observed

    My best was 30 (really). Haven't been able to duplicate (or get near it) it since.

  10. #9
    drewsdeville is offline Cadillac Owners Master
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    Re: Best MPG you've observed

    28 in a 4.9 Deville over 310 miles.

  11. #10
    Caddydrummer67's Avatar
    Caddydrummer67 is offline Cadillac Owners Fanatic
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    Re: Best MPG you've observed

    Just the other day I drove 300 miles on just under a half tank in my ETC. Really, I swear.
    That's gotta be 30 MPG or better.
    The tank was topped off and I think I may of had a tailwind for a good part of the trip.

    What's the capacity of the stock tank on a '97 ETC?
    18 gallons, 20? ..........I've never really paid attention and I rarely let it get close to empty before fill-up.

    ----------

    That was averaging probably 75 mph, on mostly flat road, with bran-new tires at 35 psi.

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Best MPG you've observed

    I believe tank capacity is 18 gallons.

  13. #12
    hamwinkie is offline Cadillac Owners Member
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    Re: Best MPG you've observed

    I have done many trips from Seattle to Bremerton which is about 80 miles and I averaged over 28 MPG sometimes getting around 31-32 with it on cruise control at 60-65. But when I take it off cruise control I average about 27 until I get in the left lane...

  14. #13
    Amir A's Avatar
    Amir A is offline Cadillac Owners Member
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    Re: Best MPG you've observed

    I drive 5 miles on the streets, and about 4 miles on the freeway everyday , my average is 15 mpg.

  15. #14
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
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    My SLS, 77.2 miles with 2.6 gal of fuel, 29.7 MPG. 75mph for about 25 miles, 55mph for about 5 miles then 65mph for the rest. Used cruise control the entire way.

  16. #15
    amunderdog is offline Cadillac Owners Connoisseur
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    Re: Best MPG you've observed

    24mpg

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