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wheres my mileage????

Discussion in '1982-Present GM Diesel' started by 55Willy, Mar 6, 2003.

  1. 55Willy

    55Willy 3/4 ton status

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    89 6.2 with 108,000 miles + th400 + 35's + 4.10's = 12 MPG

    I was looking for 15-17MPG with this. /forums/images/graemlins/confused.gif
    wheres all of it going?
    air filter and fuel filter are new.


    -Jeremy
    "The DEEZEL newbie"
     
  2. rugger03

    rugger03 1/2 ton status

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    well, are you doing alot of hwy driving, are you on the skinny pedal hard? rember diesels have a lower redline than gassers, you need to keep the rpm's lower to get the milage. If your tires are a true 35" your engine is turning at about 2560rpms at 65, the ideal rpm range for best mpg is around 2000.
     
  3. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    well, are you doing alot of hwy driving, are you on the skinny pedal hard? rember diesels have a lower redline than gassers, you need to keep the rpm's lower to get the milage. If your tires are a true 35" your engine is turning at about 2560rpms at 65, the ideal rpm range for best mpg is around 2000.

    [/ QUOTE ]

    He got it.
    /forums/images/graemlins/thumb.gif

    I get 30MPG around town and 20MPG on HWY running 70MPH with 35" / 465 / 308 gears.
    I am around 1800RPM's
     
  4. 55Willy

    55Willy 3/4 ton status

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    hhhmmm I need a tach.
     
  5. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    hhhmmm I need a tach.

    [/ QUOTE ]

    I don't have the tach yet and I want one but I did the math like he did.
    /forums/images/graemlins/thumb.gif
     
  6. 55Willy

    55Willy 3/4 ton status

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    Or I could throw on some 38's to take the rpm's back down,LMAO
     
  7. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    Or I could throw on some 38's to take the rpm's back down,LMAO

    [/ QUOTE ]

    It's what I did.
    Mine topped at 60 with the 33" tires so I went bigger.
    and my mileage got better.
     
  8. 4x4dreamer

    4x4dreamer 1/2 ton status

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    I saw a formula somewhere that showed how the mileage in a diesel went down for every 100 rpms over a certain number you went. It was pretty cool. Anybody else seen that around? I'll see if I can find it.
     
  9. 55Willy

    55Willy 3/4 ton status

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    went back and dug this one up, I'm adding in a set of 373 axles soon so I can get the mileage I wanted.
    I went with 373's sicne I already had em laying around and the rear is a full floater instead of a semi. /forums/images/graemlins/smile.gif
    i'll see the difference once i run it up to portland (same trip I got 12 on)
     
  10. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    [ QUOTE ]
    i'll see the difference once i run it up to portland

    [/ QUOTE ]
    SUCKER!!!
    and you know what im talking bout....
    grant
     
  11. 55Willy

    55Willy 3/4 ton status

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    I know what your talking about, but I never took the burb there /forums/images/graemlins/pimp1.gif
     
  12. 69K5

    69K5 1/2 ton status

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    does a blazer have a good passing ability with say a 6.2 35's and 3.08?? i know they arent speed demons anyway but i would like to be able to pass someone. does the higher numerically lower gears affect this?? I have 4.56 now and they will definatley have to go once i get my diesel in there i see already.
     
  13. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    does a blazer have a good passing ability with say a 6.2 35's and 3.08?? i know they arent speed demons anyway but i would like to be able to pass someone. does the higher numerically lower gears affect this?? I have 4.56 now and they will definatley have to go once i get my diesel in there i see already.

    [/ QUOTE ]

    I would say the passing ability isn't going to be good.
    It would get you great mileage but it will be a dog.
    I get 30MPG with this setup now but I am putting 3.73's and I will let you know how it goes.
    Now Semis will pass me uphill. I am hoping I will be able to pass them.
    /forums/images/graemlins/thumb.gif
     
  14. 69K5

    69K5 1/2 ton status

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    do you have anylift or is it all fender trimming?
     
  15. imiceman44

    imiceman44 1 ton status

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    It's a 2" lift and lots of trimming.
    /forums/images/graemlins/thumb.gif
     

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