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Thread: Whats the Avreage GAS milage

  1. #1
    Join Date
    Feb 2003
    Location
    Sand Springs, Ok
    Posts
    6

    Question Whats the Avreage GAS milage

    I have a 90 sc, my Gas gauge is broken . it is always pegged at over full . Untill I can get this fixed what is the average gas milage of the SC, under normal driving conditions? I need this so I can just estimate the miles I go/ per gallon of gas.... I dont want to run out and be stranded thanks to ALL of you .
    Michael, Exotic Autohaus

  2. #2
    Join Date
    Sep 2002
    Location
    Washington PA
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    2,517
    well i got between 11-12mpg in town with my 89 5 speed and 19-27 on the highway. With my 95 auto I got 31mpg on the highway, not sure about in town. BUt normally you will need to fill up after 150 to 200 miles of in town driving

  3. #3
    Join Date
    Jan 2003
    Location
    Victorville, CA
    Posts
    1,379

    5spd - AOD slightly diff

    My stock AOD was 20 avg - 16 city, 28 hywy. The 5spd was 21 avg - 17 city, 29 hywy.

    Hope that helps.

  4. #4
    Join Date
    Oct 2002
    Location
    Cincinnati
    Posts
    24
    how do you fix that gauge problem.... sending unit??? or just the new gauge... or both??? and Ive been looking for aftermarker sending units... no luck.... do you have to get it from ford??? or is it something else... can the float get stuck??? its really annoying not really knowing how much gas you have... and I bought the car like that... so I never had a real tank reading... thanks

  5. #5
    Join Date
    Jan 2003
    Location
    Victorville, CA
    Posts
    1,379

    Lightbulb It sounds like....

    either a short in the wiring or the sending unit. I'd take a meter a check for a short before doing anything else.

  6. #6
    Join Date
    Oct 2002
    Location
    Cincinnati
    Posts
    24
    as the tank empties... the needle starts to dip.... and the low fuel indicator finally goes off when it starts dipping.... but its never a true reading... how do I check the meter for a short??

  7. #7
    Join Date
    Jan 2003
    Location
    Victorville, CA
    Posts
    1,379

    Smile More symptoms!

    With what you just posted, I'd say it's at the gauge itself. You're getting a reading from the sender and harness (low indicator works) so that just leaves the short wire or connector to the gauge or the gauge itself. Have you tried re-seating the connection to the gauge? Could just be a loose or corroded connection.
    Last edited by rivlee; 03-10-2003 at 01:00 PM.

  8. #8
    Join Date
    Oct 2002
    Location
    Cincinnati
    Posts
    24
    no I havent tried anything... the low fuel indicator comes on when I fill it up and stays on most of the time... what do I do??? just take the gague out and reconnect it??? how do I test for a short??? or is it a different prob since the low fuel indicator comes on most of the time... thanks a lot for your help...

  9. #9
    Join Date
    Sep 2002
    Location
    Washington PA
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    2,517
    I know my 89 used to get stuck on fulll after a hard launch with wheel hop somtimes. Then sometime later it would go back to normal.

  10. #10
    Join Date
    Jan 2003
    Location
    Victorville, CA
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    1,379

    Unhappy Sorry Matt, I mis-read the posting.

    The low indicator comes "ON" when you fill up and the gauge reads full? Then as the tank empties, the low goes off and the gauge starts to drop. That's a weird one! Without more info, it's just a guessing game. But it still sounds like a short somewhere.

    You're going to have to measure, with a multimeter, the resistance between the lead going onto the gauge and ground. At the other end, measure, to ground, both the lead going to the sender and the line coming out of the sender.

    To do these things requires tearing the dash apart and to really see what you're doing, drop the fuel tank. If you don't feel comfortable doing that, find a reliable garage. They should be able to diagnose in an hour or 2.

  11. #11
    Join Date
    Sep 2002
    Location
    I live in Denison, TX--with 2 1/8 mile and 2 1/4 mile track within a 3 hour drive radius
    Posts
    259
    hmmm. i usually get 16 mpg when i drive "spirited", and if i dont let the boost guage reach positive pressure, i get about 25. I would love to get 31 MPH. (Even though TX gas is ONLY 1.79 for the 93 octane)

  12. #12
    Join Date
    Apr 2002
    Location
    St. Charles, MO
    Posts
    20,899
    On the way back from a mini-meet yesterday I only managed 15.5 mpg. I have a 2700 stall non locking converter and 3.73 gears, so the tach was showing about 3000 rpms to go 85mph.

    If I'm driving it hard I can practially watch the fuel gauge drop.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  13. #13
    Join Date
    Feb 2003
    Location
    Montgomery, Alabama
    Posts
    234

    95 FUEL TANK SIZE?

    What size are the tanks? How many gallons?

    Chris

  14. #14
    Join Date
    Jul 2002
    Location
    Roanoke, Virginia
    Posts
    3,182
    Chris...the tanks are 15 gallons, and damn it's a small world man! I once lived in Coloma Michigan about 7 years ago.

    You should move to Va it's much warmer

    -Tim
    Current Collection
    1994 Thunderbird SC - Auto converted to 5spd

    1995 Thunderbird SC - Auto

    1994 Thunderbird SC - 5spd
    1989 Thunderbird SC - 5spd - Daily Driver
    1990 Thunder/Cougar XR7 - 5spd
    1994 Thunderbird SC - 3v Project

  15. #15
    Join Date
    Sep 2002
    Location
    I live in Denison, TX--with 2 1/8 mile and 2 1/4 mile track within a 3 hour drive radius
    Posts
    259

    Cool

    what year did they drop from 18 to 15?

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