GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 3 of 3
  1. #1
    Jr. Apprentice
    Join Date
    Nov 2008
    Northern California

    Default Is there much of difference in mpg between a 4.8L and 5.3L?

    I just bought a 2008 Silverado LS with the 4.8L V8. Considering I wanted to add a camper shell, bedliner, rear sliding window, 6" assist steps, and lockable tailgate... I had less money to work with. Originally, I wanted to get the 5.3L, but after adding in the options and tax/license fees, I was pushing my original budget.

    My question is, is the long run, would the 5.3L with the Active Fuel Management save me a lot more fuel and money? It's pretty much too late now since I already bought the truck, but I'm just curious.

    I don't really plan on using the truck as a commuter. It's mainly for weekend house projects, and a backup vehicle in case my reliable Honda ever does die out on me.

  2. #2


    im not exacly sure on that I have heard that it is not all that helpfull

    it dosent switch to 4cylinders when idiling,or stopped at a light which would be helpfull.

    2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
    4inch suspension 3inch body
    Straight 6 (383 Stroker within a year)
    36inch SuperSwamper TSL.
    Detroit Loccers
    Daily Driver Weekend Wheeler
    much more...

    2004 Sierra crew cab, 2wd, 5.3 V8
    2inch Daystar Leveling kit
    single dumped Flowmaster 40 sieries exaust(removed)
    Mb Blitz Chrome wheels
    Leer Bed Cover(for sale)
    50k miles

  3. #3


    Probalby wouldn't save you all that much. The AFM goes back into V8 mode when it senses 6% throttle which is all the dam time. You can tune for it to stay on longer or turn it off.
    2008 Silverado 1500 Ext Cab 4wd LT1 Package with 20" wheel upgrade,K&N CAI, Magnaflow Catback Dual Side Exit, Tuff Country 2" Leveling Kit, Blackbear Tune, 6k HIDS Low and High Beams, 3K HID fog lights, LED tailight bar

Similar Threads

  1. what is the difference
    By 07silverado07 in forum Chevy Truck Accessories
    Replies: 4
    Last: 03-22-2010, 10:24 PM
  2. What a difference!
    By silveradfo24's in forum Photo & Video Gallery
    Replies: 12
    Last: 03-21-2010, 04:57 PM
  3. What is the difference between a z71 and non z71
    By 99monguse in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 3
    Last: 03-06-2010, 11:14 PM
  4. is their a difference?
    By 5speedsilverado in forum General Chevy & GM Tech Questions
    Replies: 11
    Last: 06-18-2009, 03:57 PM
  5. Is there a difference between HD and WT.
    By Chevy355Blazer in forum Chevy Truck Accessories
    Replies: 4
    Last: 01-18-2009, 10:22 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts