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

Discussion in 'Performance & Fuel' started by Tutut, Nov 4, 2008.

  1. Tutut

    Tutut New Member

    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. 04sierracrewcab

    04sierracrewcab Epic Member 5+ Years 1000 Posts

    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. :neutral:
  3. Stouffer

    Stouffer Rockstar 100 Posts

    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.

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