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A different gas mileage question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 91K5, Jan 18, 2002.

  1. 91K5

    91K5 1/2 ton status

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    Location:
    Wichita, Kansas
    I've always paid attention to all posts about gas mileage, but was kind of wondering what kind of gas mileage drop one could expect with say a 6" lift and 35" tires? Since different year trucks will natrually start out with different mileage I thought this type of question might be more realistic. I'm getting a pretty good 15-16mpg on average in stock form, so I was just wondering if anyone knows a before and after gas mileage for their truck. My K5's a daily driver so it's somewhat important [​IMG]
     
  2. TorkDSR

    TorkDSR 1/2 ton status

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    Location:
    bucks co pa
    i got a lifted 79 k165 with a sbc400 and 307s and a 700 and sometimes i run 35s and get 8-11 with the 38.5 hawgs i get 7-10, but i gotta get some rears[​IMG]

    beligerence doesn't justify intelligence.
    <font color=blue>wheelers hate posers.</font color=blue>
    <font color=red>79k15/400/700r4/205/38.5</font color=red>
     
  3. Headbanger

    Headbanger 1/2 ton status

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    Location:
    Moreno Valley, California. U.S.A.
    I've got an '89 Blazer with 6" lift and 35" Super Swamper SSR's with a 4:56 gear change and usually get 10 to 11 mpg in town and 15 to 17 mpg highway with the 700R4 overdrive trans.
     
  4. 90K5

    90K5 1/2 ton status

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    It is realloy hard to calculate this, because the new tires will cause the odometer to be off by about 12%, and when you change gears, they are never really that close to bringing it back to stock. It depends on what kind of driving you do. If you drive o nthe freeway a lot, it should be pretty good, but around town it will get worse because its harder to get those bigger tires moving. If I had to guess, you'll get somehwere around 12 mpg...the odometer will probably continue telling you that you get around 14-15 though...

    90K5
     
  5. 90K5

    90K5 1/2 ton status

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    Actually I messed up. You will get better thatnwhat the odometer says if you stick with stock gears, becuase you are going more miles than it thinks.

    90K5
     
  6. k20

    k20 3/4 ton status

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    shoot how y'all get it sooooo good? my truck gets about 6-8 everywhere :(. 33's, 4.10's, TH400, and 350TBI. wish i had a overdrive but my tranny will do. (till gas prices go back up
    :( )
     
  7. K5Buckeye

    K5Buckeye Registered Member

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    Location:
    WA
    Just did a cross country roadtrip:
    Originally my truck had 3.73's, 32 (actual measurement, 30.5), th-350, 350, carbed, headers, dual exhaust, no lift. I got 13-15 mpg on the freeway running 2500 rpms.
    Currently, everything is the same except a 4 inch lift and 35 (actually just shy of 34). Just drove to WA from OH. Now, I get 11-12 at 2500 rpms. Hope that helps a bit.

    1972 K5
     
  8. 90K5

    90K5 1/2 ton status

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    I used to get 14 on the highway, 12 in the city with 33's, 3.42s' a 350TBI and 700R4. Now I have 4.11's and get about 13 in the city. These are corrected figures.

    90K5
     

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