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Getting 10 MPG, please help!

Discussion in 'The Garage' started by chev4life, Feb 1, 2004.

  1. chev4life

    chev4life 1/2 ton status

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    Ok, this what I've got... '87 TBI K5, 10b f/r, 3.42 gears, auburn in rear, 33" ProComp MT, 135k on entire setup, mostly stock, many sensors and wear items replaced in motor new intake, flow master exhaust..... how/what do I do to get a little more miles out this $$$$ gas? Could my pass side exzhaust manifold leak be helping? Any ideas? I drive fast all the time, but I used to get 13 at least doing the same stuff. Thanks for any help.
     
  2. Confedneck

    Confedneck 3/4 ton status

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    10 mpg? i wish i got that.. i might get 6-8... on a stock worn out 350 with a 4 spd, stock manifolds and a holley intake and carb.. but have you looked into headers, maybe a throttle body spacer? how recent of a tune up, what do the plugs and wires look like? maybe time for new plugs, r45t plugs are cheap, i got all 8 of mine for like 11 bucks, ac delco and all... /forums/images/graemlins/thumb.gif
     
  3. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    10mpg!!!!! I wished!!!! I get 6-8 mpg with 350 w/ Edlebrock Performer Intake & Edlebrock #1406 carb with headers!
    Bill
     
  4. RustBuket

    RustBuket 1/2 ton status

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    I get about 12ish in town and like 16-18 on the highway
    The 305 does alright. /forums/images/graemlins/waytogo.gif
     
  5. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    [ QUOTE ]
    I get about 12ish in town and like 16-18 on the highway
    The 305 does alright. /forums/images/graemlins/waytogo.gif

    [/ QUOTE ]

    What is your setup IE:engine,axles,gears,tires,lift,etc,etc....
    Bill
     
  6. heavy4x4

    heavy4x4 1/2 ton status

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    I had just about the same setup as you on my 'burb. I was getting 10mpg, sometimes up to 11 or 12.

    I've stopped figuring out my mpg, it was too depressing.

    Only thing I can suggest is 1) ignition hop-ups 2) general tune-up, check timing etc 3) "I drive fast all the time" /forums/images/graemlins/shame.gif

    /forums/images/graemlins/peace.gif
     
  7. RustBuket

    RustBuket 1/2 ton status

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    [ QUOTE ]
    [ QUOTE ]
    I get about 12ish in town and like 16-18 on the highway
    The 305 does alright. /forums/images/graemlins/waytogo.gif

    [/ QUOTE ]

    What is your setup IE:engine,axles,gears,tires,lift,etc,etc....
    Bill

    [/ QUOTE ]

    I suppose that makes a difference....here is the setup:

    engine: edelbrock performer intake
    flowtech cheapy headers
    dual exhaust
    emissions stuff removed
    the rest of the drivetrain is stock and the tires are also stock /forums/images/graemlins/1zhelp.gif
     
  8. heavy4x4

    heavy4x4 1/2 ton status

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    [ QUOTE ]
    and the tires are also stock

    [/ QUOTE ]

    That's why. /forums/images/graemlins/waytogo.gif
     
  9. Confedneck

    Confedneck 3/4 ton status

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    i have 33s and 3.42 gears with a 4 spd, only way for me to get better mileage is to buy another vehicle lol..
     
  10. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    [ QUOTE ]
    [ QUOTE ]
    [ QUOTE ]
    I get about 12ish in town and like 16-18 on the highway
    The 305 does alright. /forums/images/graemlins/waytogo.gif

    [/ QUOTE ]

    What is your setup IE:engine,axles,gears,tires,lift,etc,etc....
    Bill

    [/ QUOTE ]

    I suppose that makes a difference....here is the setup:

    engine: edelbrock performer intake
    flowtech cheapy headers
    dual exhaust
    emissions stuff removed
    the rest of the drivetrain is stock and the tires are also stock /forums/images/graemlins/1zhelp.gif

    [/ QUOTE ]
    Try it with 38' and 4:56's and at least 6" lift the big parachute effect! /forums/images/graemlins/histerical.gif
    Bill
    Bill
     
  11. RustBuket

    RustBuket 1/2 ton status

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    Don't worry guys, I want big tires! I just can't afford them right now!
     
  12. spearchucker

    spearchucker 1/2 ton status

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    First of all, it sounds like you're running stock gears with larger than stock tires. And I also assume that there hasn't been any speedo correction done, which would mean that you're odometer is also off which would mean that your calculations for mpg would also be off. If for exampl the speedo is reading 10% slow, then your odometer will also be 10% below what it actually is, which means that you are actually getting 11 mpg.
    Now if you take that into account, and that it takes more gas to get your larger than stock tires to start moving, you can see why you have a decrease in mpg. What am I saying? ... get your speedo corrected unless you want to calculate incorrect mpg, keep your foot off the gas, and the biggest lesson, when you have a large truck don't worry about mpg. /forums/images/graemlins/thumb.gif
     
  13. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    Exactly quit worrying about MPG if you own a K5 with mods /forums/images/graemlins/peace.gif! It's a Big Boy Toy /forums/images/graemlins/thumb.gif!
    Bill
     
  14. 99firehawk

    99firehawk 1/2 ton status

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    Im getting about 13-14 around town, and 15-16 on the free way with mine

    gm 350 crate motor
    wieand stealth intake
    holley 750
    msd distrubtor
    electric fans
    underdrive pullies
    hedman headers true duals thru thrust turbos
    t350 with a 2000 stall
    6 inchs lift
    35x12.5 bfg ats
    10 bolts with 3.08s
     
  15. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Kwitcherbitchin with 10 mpg!!! /forums/images/graemlins/rolleyes.gif Try living with 5 mpg like my K30 does with the 454. /forums/images/graemlins/tongue.gif
     
  16. Tweetysuarus

    Tweetysuarus 1/2 ton status

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    [ QUOTE ]
    Kwitcherbitchin with 10 mpg!!! /forums/images/graemlins/rolleyes.gif Try living with 5 mpg like my K30 does with the 454. /forums/images/graemlins/tongue.gif

    [/ QUOTE ] /forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif /forums/images/graemlins/histerical.gif
    H377 you get just about the same as me Wes!
    I think he hasn't figured out that this is not a cheap or economical form of transportation!
    Bill
     
  17. BrianDamage

    BrianDamage 1/2 ton status

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    I've got close to the same set up as yuo and am now getting around 14 mpg.

    I was getting 9 mpg, then I went to change my transmission filter (700R4) and the lock-up solenoid was not mounted as it should be. It was just hanging by the wires when I took my pan off. I fixed that and now get around 14 mpg. /forums/images/graemlins/peace.gif
     
  18. az-k5

    az-k5 1/2 ton status

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    Hey, I was excited when I got a tune up done and my milage JUMPED up to 10 mpg (jump in a k5 is from 8 to 10). My buddies 87 sub with tbi only gets 11 mpg. K5's are like mud tires, if mileage is a question you have to ask you shouldn't own either /forums/images/graemlins/shame.gif.
    My .02
     
  19. thatK30guy

    thatK30guy 1 ton status Premium Member

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    It's posts like this that makes me wished I kept my old '81 SWB K10 with a 250 inline 6, 465, 208, 10 & 12 bolts w/3.73's, and got me 18 mpg on the highway. I sold that truck to buy some new 33" BFG A/T's on 16.5" Weld Racing SS II's. /forums/images/graemlins/tongue.gif I still have the Welds leftover after all that. /forums/images/graemlins/doah.gif
     
  20. joez

    joez 1/2 ton status

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    [ QUOTE ]
    K5's are like mud tires, if mileage is a question you have to ask you shouldn't own either /forums/images/graemlins/shame.gif.
    My .02

    [/ QUOTE ]

    Im averageing between 22-25 mpg with my K5.









    Its all about the diesel /forums/images/graemlins/woot.gif
     

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