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  1. #1

    Default how to up my MPG

    Hello,
    I was curious , how would I up my mpg ?

    My suburban is a 1995 , 1500 with a 350 I believe ...and it has a carburator

    I know by experiance with past vehicles that spark plugs , CAI , and a few other things help , but I've never owned a vehicle with a carburetor so what can I do . I currently get about 11 city 15 hwy ...completely stock , new fuel filter brand new stock paper filter and recent oil change ..thanks in advance !

  2. #2
    Jr. Engineer
    Join Date
    Feb 2012
    Location
    Western Maryland/Wyoming
    Posts
    290

    Default

    Andy, Your Suburban should have TBI, throttle body injection, and not a carb. I had a 95 and could get almost 20 mpg, on the highway. Totally stock except for synthetic oil and lubes.

  3. #3

    Default

    As said already, it's not a carb, but a TBI system (which looks like a carb, but is just a big throttle opening, with a fuel injector).

    Biggest things that will help you is keeping the engine oil, filters, and fuel system well maintained; and keeping the tire pressure up near the max for your tires (probably around 42 PSI), keeping the load down (empty cars are lighter cars), and keeping your foot out of the floor when accelerating.

    Plugs won't really help (unless yours are worn out, or poorly indexed or gapped). A CAI kit for your truck won't really help either, as it doesn't eliminate what appears to be the problematic piece in the intake tube, which is the neck on the filter housing. A filter housing that kept the neck leading to the air intake tube on the side, more close to round, would be helpful, but probably not enough to get excited about.

  4. #4

    Default

    Thanks guys . I usually stay at around 2000 rpm or lower to save gas and tire pressure is fine ...could be that the motor has over 300k miles on it lol . I was just hoping there was some mods or something that I could do to increase the mpg . I have the original dealer paper that goes in the window and it says 13mpg hwy

  5. #5

    Default

    Quote Originally Posted by Andy_Panda View Post
    Thanks guys . I usually stay at around 2000 rpm or lower to save gas and tire pressure is fine ...could be that the motor has over 300k miles on it lol . I was just hoping there was some mods or something that I could do to increase the mpg . I have the original dealer paper that goes in the window and it says 13mpg hwy
    Well if it says 13, and you're getting 15, sounds like a win to me.

    But there isn't really much you can do on the older TBI engines in ways of simple mods to gain a MPG or two. And that's all you would get, if you could do the mods to get them. There's one injector for all eight cylinders, and it's at basically the furthest reasonable point from the intake valve that it can be. So you can't really do much in the way of tuning. The intake system doesn't have any huge/odd bottlenecks that a CAI would help get rid of. The main issue with the intake system is that it goes from a 3" circle to an almost flat rectangle at the neck of the filter housing.

  6. #6
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    I disagree, you should be getting better, when my parents had there 92 we could pull 22 mpg at 75 mph loaded with three kids and luggage. The old TBI are much easier then the vortec motors to squeeze more mpg out of. New distributor, wires and plugs will help greatly. Also have you ever changed diff fluids? Just getting some new fluid in the rear differential will help. Just get a stock replacement K&N and make sure the timing is correct.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  7. #7

    Default

    I think we should start a new thread with a similar content and just patrol it better.

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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