COMPLETE LS SWAP MPG

Discussion in 'G-Body LS Swap' started by 20Grand, Jun 12, 2018.

  1. 20Grand

    20Grand Apprentice

    Joined:
    Mar 16, 2018
    Messages:
    59
    Likes Received:
    9
    Trophy Points:
    8
    We took a trip from Omaha to Las Vegas a few days ago and averaged almost 22 mpg going 75-80. The swap is a 5.3 from an 05 Silverado. That includes running AC full time and mountain passes. The last part of the trip from Salina, Ut to Vegas was right above 19, which my average speed was around 85-87 and some very steep inclines coming out of Salina. I thought this was pretty excellent. I’m running 20” Camaro wheels with low rear end gears and a good tune. New O2 sensors as well.
     
    • Like Like x 6
  2. 69hurstolds

    69hurstolds Greasemonkey

    Joined:
    Jan 2, 2006
    Messages:
    239
    Likes Received:
    60
    Trophy Points:
    28
    Sounds great. All that plus a little better power than stock as well? Can't beat it with a stick. Well, you could, but the body work bill would be astronomical to fix.
     
    • Funny Funny x 1
  3. street sweeper

    street sweeper Apprentice

    Joined:
    Jun 12, 2017
    Messages:
    82
    Likes Received:
    68
    Trophy Points:
    18
    Location:
    Central Indiana
    im assuming a 4l60e and a factory highway gear?
     
  4. CaliWagon83

    CaliWagon83 G-Body Guru
    Silver

    Joined:
    Nov 12, 2017
    Messages:
    906
    Likes Received:
    325
    Trophy Points:
    63
    Location:
    Orange County, CA
    I’d be very happy with that, especially considering the difference in power over stock. I read somewhere that a ‘55 Chevy with a 6.2L E-Rod swap got about 23 mpg highway.

    I would be thrilled with that level of FE in my wagon, considering it probably gets less than that with the wheezy stock V-6. What rear end ratio are you running?
     
  5. 20Grand

    20Grand Apprentice

    Joined:
    Mar 16, 2018
    Messages:
    59
    Likes Received:
    9
    Trophy Points:
    8
    Yes, 4l60e with stock 2.73s I believe is what it is. I drove 2005+ Cad STS’s and even their v-6 couldn’t do that. The best I ever got with those 8s were 18 and I’d have to do 65 to get it. The only thing I’d like to do is increase the gears. I overheated going up a mountain in Utah and I wonder if that had anything to do with it. But, posted this so people knew what was going on. I’m a stickler for efficiency and mpg.
     
  6. CaliWagon83

    CaliWagon83 G-Body Guru
    Silver

    Joined:
    Nov 12, 2017
    Messages:
    906
    Likes Received:
    325
    Trophy Points:
    63
    Location:
    Orange County, CA
    Out of curiosity, what were your freeway RPMs at 75-80?
     
  7. 20Grand

    20Grand Apprentice

    Joined:
    Mar 16, 2018
    Messages:
    59
    Likes Received:
    9
    Trophy Points:
    8
    I wish I knew but I don’t have an rpm gauge. It feels low, and I’d say somewhere around 1800. I don’t have much power in 5th.
     
  8. 20Grand

    20Grand Apprentice

    Joined:
    Mar 16, 2018
    Messages:
    59
    Likes Received:
    9
    Trophy Points:
    8
    Do you have an rpm gauge setup on a ls swap?
     
  9. oldsmobile joe

    oldsmobile joe G-Body Guru

    Joined:
    Nov 12, 2015
    Messages:
    786
    Likes Received:
    438
    Trophy Points:
    63
    Location:
    mpls
    if you tell us the tire size and rear end gear ratio, transmission type and does it have lock-up converter. we can tell you the rest
     
  10. 20Grand

    20Grand Apprentice

    Joined:
    Mar 16, 2018
    Messages:
    59
    Likes Received:
    9
    Trophy Points:
    8
    Tell me the rest about what? 245/35/20, 273 and 4l60e. Not sure on converter. All stock 05 Silverado.
     
Loading...
Similar Threads - COMPLETE SWAP MPG Forum Date
Complete LQ9 swap to cutlass G-Body LS Swap Feb 10, 2016
El camino 5.3 lm7 swap G-Body LS Swap Jun 5, 2018
Cruise Control LS Swap DBC G-Body LS Swap May 16, 2018
A/c with Ls Swap G-Body LS Swap May 2, 2018
El Camino LS swap fuel tank G-Body LS Swap Apr 19, 2018

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice