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MPG Thread, curiosity

Discussion in 'The Garage' started by sled_dog, May 3, 2003.

  1. sled_dog

    sled_dog 1 ton status

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    Location:
    Austin, TX
    Want to see what everyone is getting for mileage. I know this has been talked about before just want to see if anyone is doing worse than me. Please state your model year, injection system(tbi, tpi, carb if carb state what), engine, exhaust, rear ratio, and tire size.

    84 K5
    Stock Quadrajet carb
    brand new rebuilt 355 with manifolds and dual glasspacks
    sm465
    2.73s with 33s
    MPG - 6

    I am serious by the way, most people think I shoudl be doing great with those 2.73s but umm no. Oh and my quadrajet isn't tuned right so my secondaries never open. Gonna fix that tomorrow I hope should be great to get like 4 mpg.
     
  2. Langosta39

    Langosta39 1/2 ton status

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    Location:
    Moscow, Idaho
    Yeah! I'm second:

    86' 454 Quadrajet, 10's of 1000's of miles, no emissons stuff
    4spd
    4.10s with 35x14.5 thornies
    2.5" manifolds, true duals, glasspacks
    1-ton gear, long bed

    CITY: 6mpg on a good day
    HIWAY: 10mpg at 60 with no passing

    andy
     
  3. heavy4x4

    heavy4x4 1/2 ton status

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    Location:
    Delafield, Wisconsin
    1990 burban
    4" lift
    33's - 3.42 ratio
    Tbi 350

    My mileage hangs right around 10mpg - rarely more than that.
    We'll see how that changes when I go to 4.10's.
     
  4. Swanson52

    Swanson52 1/2 ton status

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    Location:
    Centennial, CO
    My longbox was set up like this:

    78 LWB
    4.10's
    TH400
    Quadrajet on a box-stock 350
    36x12.50R16 tires.

    On the highway, on a good day I could get 13 MPG, but averaged about 10-11.
     
  5. RATAH

    RATAH 1/2 ton status

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    Location:
    Franklin,Ohio
    1985 K5 Blazer
    350-350-205
    35x12.5x15 SSR's
    3.08 gears
    8 mpg
    give or take a few as my speedometer is off
     
  6. Thumper

    Thumper 1/2 ton status

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    Location:
    Alberta Canada
    1985 K5
    327 300hp/ Edelbrock Performer 600/ sm465/ 205
    4:56s
    35"
    12-15 hwy and 10 city

    Mike
     
  7. chevblazk5

    chevblazk5 1/2 ton status Premium Member

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    Location:
    Sayreville, NJ
    1980 K20
    4.10s
    33s
    TH400
    350 - Holley truck avenger carb, Hooker headers, Edelbrock
    intake
    Highway: 12
    City: 7-8
     
  8. amm888

    amm888 1/2 ton status

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    Location:
    Woodland Hills, CA
    '76 k5
    don't know type of carb
    rebuilt 400 dual flowmaster exhaust
    don't know ratio yet (thinkin 3.73)
    35" tires
    10+ mpg (speedos way off, so don't know exact)
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Joined:
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    Location:
    E-town baby!
    81 Jimmy
    mechanical injection
    6.2 with about 220 K
    SM 465
    4.56's with 39.5's

    I average 17 miles per US gallon combined city and highway...

    Best mileage I ever got with my 355 was 16 on a long freeway trip. That was with 2.73's, the 465 and 33's. If you're getting 6 you need to do some serious tinkering with the Quarda-toilet...

    Rene
     
  10. sled_dog

    sled_dog 1 ton status

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    Austin, TX
    yeah I really do need to mess with it big time. A family friend claims he can tune her in for me so I am going to go there tomorrow I think.
     
  11. alesko

    alesko Registered Member

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    Location:
    sw pennsylvania
    76 1 ton dually
    366 ci
    600 edelbrock performer
    summit bbc headers
    3" exhaust
    3;73 rears
    265/70/16's

    5mpg city, highway, or just sitting there
     
  12. k30gambi

    k30gambi 1/2 ton status

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    Location:
    illinois
    I agree, something's wrong if your getting 4-6mpg with a q-jet. I get 9-10mpg on my 454 with a comp cam, 2.19/1.88 valves and 4.10 gears driving like a typical person who is late to school every morning. /forums/images/graemlins/eek.gif If your secondaries dont open your choke might be closed all the time giving you sh!t for milage, right? that's the way mine was.
     
  13. k20

    k20 3/4 ton status

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    Location:
    Mineral Springs, NC
    87 K20
    old worn slap out, partially blown.....ok fine blown but nursed.... 350 TBI
    Th400
    33's with 4.10's
    Mpg City 8
    MPG highway to scared to go w/ the engine like it is lol
     
  14. tucsonkfive

    tucsonkfive 1/2 ton status

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    Location:
    Tucson, AZ
    79 K5
    Performer 600
    Brand new 350, edelbrock rpm intake, hooker headers
    2 1/2" Dual exhaust
    TH350
    3.42 Gears
    33x12.5x15 bfg
    10 mpg city or highway

    Used to get 12 to 13 mpg with my old 350.
    /forums/images/graemlins/confused.gif
     
  15. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Location:
    Castro Valley, CA
    72 K5
    quadrajunk
    Thorley Headers
    2 1/4 dual exhaust
    4.11 42's
    6.5-7.5 city, better on highway
     
  16. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

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    Location:
    Bartlett, Texas
    72 K5
    Holly 750 carb.
    427 tall deck
    TH350/NP205
    D60/14BFF
    4.56-40's
    MPG- about 10
     
  17. 75-K5

    75-K5 3/4 ton status

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    Location:
    Anderson, Indiana
    75 K5
    350/th350/203
    Quadrajet
    3.08, 31"
    ~15 mpg city (never take it on highway)
     
  18. Wingnutt

    Wingnutt 1/2 ton status

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    Location:
    NOVA
    Might as well.

    '88 K5
    stock 350 with TBI (130K+ miles)
    manifolds Y'd into a 3 1\4" in 3 1\4"out screen type converter, feeding a 3 1/4" in, twin 2 1/4 out muffler exhaust
    3:43's I think maybe 3:73's gotta check
    almost new (1 year old) 700R4
    worn out 32's

    I can get 15-17 mpg on trips to the flatlands
    12-14 on trips around here
    8-10mpg in town
    (depending on the foolishness of the local ricers)
     
  19. chulisohombre

    chulisohombre 1/2 ton status

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    Location:
    Bangor,Pa
    3.4 ton 72 blazer
    350 with hei,msd,76 corrvette 2.02/1.96 valves,crane roller rockers,headers and dual2 inch exhaust.
    465/205 combo
    4.10 gears
    i get about 6 to 8 in town and about 10 on the highway. 200 miles on a tank and at 20 gallons in my tank i figure i got 10 miles to the gallon.
     
    Last edited: Nov 19, 2013
  20. sled_dog

    sled_dog 1 ton status

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    Location:
    Austin, TX
    you realize if your speedo is off your odometer is off too
     

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