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454 TBI MPG

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by grtwhite, Oct 20, 2001.

  1. grtwhite

    grtwhite 1/2 ton status

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    Just wondering what kind of mpg you guys with 454 tbi are getting? I'm talking one which is stock to mild, not a beefed up torque monster. I have a 350 tbi which gets about 13-16 mpg give or take. Dreaming of upgrading to a tbi 454 some day. From what I've read here I'll need polly motor mounts, 4 core rad, coustum chip, new exhaust, 454 tbi. Let me know if I've left out anything major. One more question, would I be able to use a BBC out of a mid 70's truck & put a tbi compatible intake manifold on it? Or would I need one out of an 87-91 burban?
    Thanks!

    - Jay
     
  2. azblazor

    azblazor 1/2 ton status Premium Member

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    I have a 2 - 454 TBI trucks. One is a backfitted 1994 1Ton factory 454 TBI engine and 4L80E with factory computer, into a 1979 K5. The other is a stock 1993 454 TBI w/4L80E in a 3/4 t 4x4 Suburban. They both get between 13-15 MPG. (They both have 4:10 difs, K5 has 33's and the Sub has 32's).

    <font color=blue>azblazor</font color=blue>
    <font color=orange> 79 K5 454-FI / 4L80E, NP205, D60, FF14, 4" lift, 9K Warn </font color=orange>
     
  3. Sparky87k5

    Sparky87k5 1/2 ton status

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    My 98 Silverado 2500 4x4 454 Vortec got 13 -15mpg with 4.10's &amp; 4L80E trans. pulling 33" rubber. My 87K5 383 gets 14 -15 pulling 4.56's, 33" rubber and 5 speed OD. But my wife has to be driving, she's the only one that seems capable of doing this on long trips. Must be her size 7 foot compared to my size 10! Don't know what else it could be.

    A good firm grip is my idea of gun control!
     
  4. Doug

    Doug Registered Member

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    I have to go along with these guys, my '93 Sub w/454 gets a pretty consistent 14 mpg.

    '85 K5, 350, 700r4, np208, 10 bolts, as of 10/2001; wish list is extensive.
     
  5. grtwhite

    grtwhite 1/2 ton status

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    Thanks guys! That pretty much makes up my mind. Gonna go with the 454 someday. More power without any real drop in gas milaege. A win win situation!!

    - Jay
     

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