Gas Mileage
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 27
Cadillac STS-V Series Forum Discussion, Gas Mileage in Cadillac V-Series Forums; Have 08 STS V with 4,000 miles. ECM replaced. MPG 11 mpg since new ECM. Prior was 16-20 mpg. Dealer ...
  1. #1
    FCBank Guest

    Gas Mileage

    Have 08 STS V with 4,000 miles. ECM replaced. MPG 11 mpg since new ECM. Prior was 16-20 mpg. Dealer says car programmed for replacement and gets poor mileage.

    Any help?

    J Fields


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    jerrylsantos is offline Cadillac Owners Member
    Automobile(s): 2006 STS-V
    Join Date
    Jan 2011
    Location
    Sacramento, CA
    Age
    32
    Posts
    84

    Re: Gas Mileage

    Did you leave your car with them? Maybe someone drove it hard while they had it, dropping the calculation?

    Or are you saying that you actually have been getting less miles per gallon?

  4. #3
    550HP STSV Guest

    Re: Gas Mileage

    i get 13, mixed.

  5. #4
    Lanman is offline Cadillac Owners Fanatic
    Automobile(s): 2008 STS-V
    Join Date
    Feb 2004
    Location
    Greenville, SC
    Posts
    160

    Re: Gas Mileage

    I have an '08 and I typicaly average 13.5 - 14.0 around town but I did manage 21.4 today on a long trip.

  6. #5
    coach123 is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac STS-V & CTS-V
    Join Date
    Oct 2006
    Location
    Atlanta GA
    Posts
    286

    Re: Gas Mileage

    Took a 6 hour trip each way for work and averaged 27.5mpg on the highway. Zeroed everything out prior to the trip and drove through the Tennessee mountains on I-75. In town it is much less but highway was not bad at all.

    It was tuned by a local tuner in Atlanta. Before all the upgrades and a retune I only averaged about 20.8mpg on the highway.

  7. #6
    jedhead is offline Cadillac Owners Enthusiast
    Automobile(s): STS-V
    Join Date
    Aug 2009
    Location
    Orange County, California
    Age
    58
    Posts
    801

    Re: Gas Mileage

    I get about 22mpg on Vegas runs @ 85mph. Mixed city/hwy suburban area about 16mpg. I have noticed that the boost gauge seems to be connected to the fuel gauge.

    Bob

  8. #7
    GoofyGuy is offline Awaiting Email Confirmation
    Automobile(s): 2006 STS-V
    Join Date
    Oct 2010
    Location
    Tampa, FL
    Age
    34
    Posts
    209

    Re: Gas Mileage

    I average 18 mpg here in Florida. Im 75% highway, usually close to the triple digits not over or at but im close. last trip I averaged 22mpg at speed limit for 1000 miles

  9. #8
    hiltonny is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac
    Join Date
    Apr 2008
    Posts
    162

    Re: Gas Mileage

    What does "programmed for replacement" mean?

  10. #9
    bobs-sts-v's Avatar
    bobs-sts-v is offline Cadillac Owners Fanatic
    Automobile(s): STS-V
    Join Date
    Feb 2007
    Location
    Naperville, IL
    Posts
    393

    Re: Gas Mileage

    Quote Originally Posted by jedhead View Post
    I have noticed that the boost gauge seems to be connected to the fuel gauge.

    Bob
    Sadly, it is an inverse relationship: More boost = Less MPG !!
    Also related to the weight of your right foot: Heavy foot = Less MPG !!

    Bob

  11. #10
    torched10's Avatar
    torched10 is offline Cadillac Owners Enthusiast
    Automobile(s): 2008 sts v, 2011EXT,65 GTO,08 vette,gt500
    Join Date
    Jan 2010
    Location
    atlanta
    Age
    48
    Posts
    553

    Re: Gas Mileage

    Quote Originally Posted by coach123 View Post
    Took a 6 hour trip each way for work and averaged 27.5mpg on the highway. Zeroed everything out prior to the trip and drove through the Tennessee mountains on I-75. In town it is much less but highway was not bad at all.

    It was tuned by a local tuner in Atlanta. Before all the upgrades and a retune I only averaged about 20.8mpg on the highway.
    coach--i too live in Atl--whodid you have tune your car--thanks BTW im getting 13.5 around town,mostly local driving

  12. #11
    JPSTSV is offline Cadillac Owners Member
    Automobile(s): 2002 Eldorado ETC, 2003 Escalade, 2007 STS-V All Black
    Join Date
    Dec 2010
    Posts
    33

    Re: Gas Mileage

    Quote Originally Posted by torched10 View Post
    coach--i too live in Atl--whodid you have tune your car--thanks BTW im getting 13.5 around town,mostly local driving
    Hey Coach and Torched10 I live around Atlanta too, actually Norcross. I am getting 14.8 around town. Maybe we can met sometime, like those California boys do, we have enough for a V-Showing .....I still have not seen a STS-V on the road, exc a Silver CTS-V the other day. Had a Challenger SRT8 challenge the other day, a little to wet for me, but he was surprised he had competition and didnt run off.......

  13. #12
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
    Automobile(s): 2013 OBM CTS-V Coupe
    Join Date
    Jun 2009
    Location
    USA
    Posts
    2,658

    Re: Gas Mileage

    Have they reflashed the ECM after they installed the "replacement"? If not I would ask to. Something is not right there.

  14. #13
    youknooow is offline Cadillac Owners Enthusiast
    Automobile(s): STS-V 1 OF 3 BLK ICE & TANGO RED
    Join Date
    Dec 2010
    Posts
    606

    Re: Gas Mileage

    Quote Originally Posted by PGA2B View Post
    Have they reflashed the ECM after they installed the "replacement"? If not I would ask to. Something is not right there.
    Coach, Torched10, and PGA2B I live in Atlanta as well!!! I travel alot for work, but I would fully support a V series meeting! Or just meeting up in general.

  15. #14
    PGA2B's Avatar
    PGA2B is offline Cadillac Owners Connoisseur
    Automobile(s): 2013 OBM CTS-V Coupe
    Join Date
    Jun 2009
    Location
    USA
    Posts
    2,658

    Re: Gas Mileage

    Quote Originally Posted by youknooow View Post
    Coach, Torched10, and PGA2B I live in Atlanta as well!!! I travel alot for work, but I would fully support a V series meeting! Or just meeting up in general.
    That would be great if I lived in GA. I'm in Missery (MO).

  16. #15
    coach123 is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac STS-V & CTS-V
    Join Date
    Oct 2006
    Location
    Atlanta GA
    Posts
    286

    Re: Gas Mileage

    I had Vengeance Racing tune my car after all the mods. They are not sponsored here so I can't give any more details. I live near Dunwoody area and I would be up for a meet sometime.

    How many people have modded their cars? If you guys have a few mods or plan to get the Spectre intake we can do a dyno day at Dynolab in Marietta one Thursday evening. On Thursday's they do a 3 dyno pull for I think $50 or $75 without O2.

  17. Remove Advertisements
    Cadillac Forums
    Advertisements
     

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts