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  1. #1

    Default What can be done to a 4.3 V6 for beeter mileage?

    I have a 2008 Silverado with the 4.3 V6 and there isnt a tuner built for it yet so I was wondering what else could be done to get better mileage?
    2008 Silverado_ Gone
    2006 HHR LT
    2008 Cobalt LT
    2001 Sonoma Gone
    2009 Cobalt XFE

  2. #2


    Quote Originally Posted by RatRod View Post
    I have a 2008 Silverado with the 4.3 V6 and there isnt a tuner built for it yet so I was wondering what else could be done to get better mileage?


    To gain better gas mileage on your Silverado, let the engine breath better. Replace the old intake box with an aftermarket one because theres no crimps in the tube, and its a higher flowing filter - but be sure to make sure its a dry filter, and not a oil based air filter because you dont want to end up placing the Mass Air Flow Sensor down the line. I've seen it too many times. You also want to throw headers on there you do gain better power, but your also opening up the exhaust ports to flow much better too. And of course if you match it with a Borla Exhaust, you'd be top of the line (Until the programmer then you'll be top of the heap)...! You'd see a great gain on performance and not much, but a definite difference on mileage. If you have any questions feel free to email me at


    Cold Air Intake


    Brody's Speed Equipment

  3. #3

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    there are some custom performance shops that are specificly for v6 engines one is if its still around, this and other similiar shops can do reflashes for the computer if you send it in. If you search you can find some that will reprogram a SC 3800 for a five speed and to be put in a cavalier, so they chould be able to do yours or give you suggestions, or just do the bolt ons that are available and a low budget ignition upgrade
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  4. #4


    I would only say a cat-back exhaust, and a cold air intake. A custom tune would be nice, but the first two defiantly. Anything else could be a waste of money.

    2006 Chevy Silverado 1500 2WD EXT Cab
    4.3L V6 Vortec, K&N Drop-In, Flowmaster Super 44,
    3" Exhaust tip, 22" Boss #331 Rims, Clifford 50.5x Alarm,
    Escalade Gauges, DJM Leveling Kit, Billet grill, All JL Audio Speakers,
    300XD MTX amp, Two 10" Alpine SWE-1042 subs

    -Check out my photo album!

  5. #5


    Well, the prolem is that it normally takes quite awhile before any of those mods pay off in term of MPG gains. Not to mention, there is no guarantee that you'll even see an increase in MPG. Might gain, lose, or have no change at all.

    As I always say, mod for performance, not MPG. The best bet is to do all of the standard things that have been said a million times... check tire pressure, maintenance, drive slower, reduce weight, etc.

    2009 GMC Sierra Denali AWD

  6. #6


    My Wife has a 08 1500 WT long bed that has got as high as 27 mpg on steady hwy around 15 city, it has a 3.4L V6 3:42 gears magnaflow single in dual out 3.5" tips and a drop in K&N

  7. #7
    Sr. Apprentice EKperformance's Avatar
    Join Date
    Oct 2008
    lake City Florida


    i know im gona hear about it but i like K&N products, take the oil is evil lightly. i have had a K&N in my truck for over 100,000 miles with no problwms and in my previous 2 trucks with no problems, as far as your truck goes i recomend an exhaust , i have flowmasters, but what ever your sound is will be fine, and dont waste money on TB spacers. headers work great and a new MAF sensor will help too. also there is an air diffuser in your throttle body, you can cut it off with a dremel or buy one already shaved. has a great right up on it. also a tune will help alot, like westers or pcm4less or any of the good places. i own a 4.3 in a 2002 silverado, its 2wd and i get 18 city 23 highway, mods are in my sig.
    2002 silverado 4.3 5spd / off road y pipe, flowmaster split duals, K&N filter
    ported throttle body , ported heads and intake < all by me

  8. #8


    Do headers make that much of a difference for the 4.3? I was looking at the JBA shorties but I wasn't sure I wanted to drop $600 for a small difference.
    2005 Chevrolet Silverado 4.3L V6
    -Dual exhaust
    -K&N Cold Air Intake
    -8000K HID Headlights

  9. #9


    Sounds like you have a set up like I did in my wife's 08 Silverado once we put the cat back,K&N filter changed over to synthetic oils our best record MPG was 27 on the highway still only gets 16-17 in the city.

    2008 Silverado long bed 4.3 V6 3.42 gears Auto trans
    Cap on the back
    MagnaFlow single in dual out with 3.5" SS tips

  10. #10
    Sr. Apprentice Akula682's Avatar
    Join Date
    Dec 2007
    Niagara Falls NY


    well the easiest way to increase your MPG's is to keep your foot out of the injectiors.

    "Do what you can, With what you have, Where you are." TR.

    2007 Chevy 2500 6.6 LMM
    1998 HUMMER- sold
    1998 F150- sold

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