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  1. #91


    Quote Originally Posted by phoebeisis View Post
    Do you have good pre dis-abled FE numbers?
    About the same??

    Pretty decent FE in any case
    The fuel economy numbers were about the same with AFM enabled. When I filled up I would get anywhere between 16.5 to 18.0 according to the DIC, so this last tankful was slightly better according to the DIC, but one tank is not considered a good sample size.

    I gather that is I drove straight level highway at 65MPH all the time where AFM could stay in V4 mode for alot longer, fuel economy might be better.

    My 2013 Silverado now has ~14K miles and the engine should be nice and broken in now, so I should be getting better MPGs.

    2013 Silverado LTZ White Diamond Crew Cab

    Advent OGM1 Navigation
    Husky Liners GearBox Underseat Storage
    Airaid MIT
    EGR Rail Caps
    K&N Air Filter
    Flowsound 40 Muffler
    Hypertech Max Energy Tune (only top end limiter removed and AFM disabled)
    Chrome Tailgate Handle Cover
    TonnoPro HF-155 Tonneau Cover
    WeatherTech Front and Rear Splash Guards
    Husky Liners X-Act Contour Floor Liners
    WeatherTech Side Window Deflectors

  2. #92


    Are you still testing your mpg?
    Has it gotten better or is it still getting between 16-18 mpg?

  3. #93

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    So far-no noticeable difference in FE?
    Pretty sure hyper milers-could show 2 mpg difference in suburban driving
    but they would drive with a eye to getting the 4 cyl mode to kick in
    Does the onboard screen TELL you when it goes 4 cylinder?
    Seems like on another forum-someone mentioned 2 cylinders??-or maybe it was the new 4.3(which gets GREAT MPG by the way and makes about 300 hp). In any case the new 4.3 is now a desirable motor
    It used to be the 4.3 was the motor you bought because you didn't want to pay $4000 more to get the higher trim level truck that the 5.3 came in.
    1998 suburban-
    1/2 ton

    199500 miles

  4. #94


    I filled up Monday morning and was getting 17.8MPG.

    So far fuel economy has not changed appreciably from when AFM was enabled.

  5. #95


    I filled up this morning and here is the DIC and hand calculated numbers:

    PHP Code:
               Miles Driven    Gallons Used        MPG
    DIC          326.1            18.1             18.0
    Hand Cacl    326.1            18.6             17.5 

  6. #96

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    17.5 pretty good-about what you said pre disabling MPG was

  7. #97


    you take that thing on a 400 mile trip and you'll get 21 mpg. I get 17-18 depending on the gas I get. Starting and stopping just 5 or 6 times during the trip to work is what kills my mileage. I have 308 gears with 2856518 nittos. I want to regear BAD. Mine wont get out of its own way unless I stomp it.

  8. #98
    Jr. Apprentice IronBear's Avatar
    Join Date
    Sep 2013
    New Hampshire


    I also have 308 gears and my truck is a slug as well, but that's the least of my worries. It's still hesitating when warm, and the engine 'ticks' (after sitting over night) when you first start it. I'm bringing it into the dealer tomorrow.
    2010 Chevrolet Silverado Z-71 Crew Cab with appearance package.

  9. #99
    Sr. Apprentice
    Join Date
    Sep 2013
    Angleton TEXAS


    Afm...... ?

  10. #100


    Active Fuel Management

    2009 Chevrolet Silverado 1500 LT Z71 Crew Cab "All-Star Edition"

    Line-X'd Bed
    Line-X'd Custom Brush Guard(Heavy Duty)
    5.3L Flex Fuel
    275/65R18 Toyo Open Country AT2's
    2" Rough Country Leveling Kit(want to get the 2.5 RC kit)
    EGR In-Channel Vent Visors
    Exterior PLUS Package
    Interior PLUS Package
    K&N Drop-In Air Filter
    Cat-Back Dual Exhaust
    Black Bowties
    Diablo Sport Predator(AFM Disabled)
    Towing Mirrors
    Next Planned Mods
    Blacked out Tail Lights
    Aftermarket Rims

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