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Thread: Mileage Increase on Trucks

  1. #1
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    Default Mileage Increase on Trucks

    What have you guys been seeing for a fuel mileage increase on the full size trucks and SUV's? I have an 01 Yukon XL, 3" lift, 325/60R18's, 3.73's and I am seeing right around 16 now. I haven't done a comparision to the stock cal in a long time, but I thought it was around 14 to start.

    Also, i put it on the dyno here at work and got 252 hp and 279lb ft. Not to bad for an intake and cat back.

  2. #2
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    With my 2000 5.3 ext cab Since Ive lowerd O2 switch points and added some timing based off the optimal timing table I can get about 21-23mpg crusing at 45-60 and about 17-20 avarage city/hyw.

    So far Ive probably got on avarage about 2-3mpg more especially on cruises.

  3. #3
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    I have a 1999 5.3 ext. cab, and I lowered my O2 switch points to:

    CL Mode Bank-1 Bank-2
    0 460.015667 460.015667
    8 460.015667 460.015667
    16 460.015667 460.015667
    24 460.015667 460.015667
    32 460.015667 460.015667
    40 465.000356 465.000356
    48 469.985046 469.985046
    56 475.003646 475.003646
    64 479.988336 479.988336

    What did you set yours at cmitchell17?

  4. #4
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    Quote Originally Posted by n6oli
    I have a 1999 5.3 ext. cab, and I lowered my O2 switch points to:

    CL Mode Bank-1 Bank-2
    0 460.015667 460.015667
    8 460.015667 460.015667
    16 460.015667 460.015667
    24 460.015667 460.015667
    32 460.015667 460.015667
    40 465.000356 465.000356
    48 469.985046 469.985046
    56 475.003646 475.003646
    64 479.988336 479.988336

    What did you set yours at cmitchell17?
    Drop the CL Mode 0,8,16 to something quite a bit lower... 250-300mv and you should see a slight improvement. Your table is still richer than 14.7:1 across the board (450mv).

  5. #5
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    Could you copy with labels from your tune, and then paste in a message what you have yours set at?
    Sorry, I didn't see who sent the message. I thought you were cmitchell17?

  6. #6
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    Why does GM have the O2 switch points set so high in their tunes?
    This is the factory switch points.

    LABELS bank
    CL Mode Bank-1 Bank-2
    0 480.022245 480.022245
    8 480.022245 480.022245
    16 480.022245 480.022245
    24 480.022245 480.022245
    32 480.022245 480.022245
    40 480.022245 480.022245
    48 489.991625 489.991625
    56 509.998203 509.998203
    64 520.001492 520.001492

  7. #7
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    Hey mine are:

    372.495363 372.495363
    372.495363 372.495363
    372.495363 372.495363
    373.343100 373.343100
    375.208120 375.208120
    380.565813 380.565813
    450.012377 450.012377
    450.012377 450.012377
    450.012377 450.012377

    Let me read up on Dc Justins post to see what he said to do.

  8. #8
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    CL Mode Bank-1 Bank-2
    0 372.495363 372.495363
    8 372.495363 372.495363
    16 372.495363 372.495363
    24 373.343100 373.343100
    32 375.208120 375.208120
    40 380.565813 380.565813
    48 450.012377 450.012377
    56 450.012377 450.012377
    64 450.012377 450.012377

  9. #9
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    I can't figure out how the closed loop modes range? Do the low ones like 0,8 just the light loads and then the 16-24 seem like they control about the same load levels?

    How should the switch points ramp up to 14.7? Should it be 250-300mv for just like 0,8,16 then quickly go up to 14.7 from there. Becuase you want it close to 14.7 going up a hill in a low gear right?

  10. #10
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    This is what I have now


    LABELS bank
    CL Mode Bank-1 Bank-2
    0 261.245820 261.245820
    8 270.802185 270.802185
    16 288.003642 288.003642
    24 337.696740 337.696740
    32 406.502567 406.502567
    40 450.461846 450.461846
    48 450.012377 450.012377
    56 450.012377 450.012377
    64 450.012377 450.012377

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