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  1. #11
    Master Mechanic SupplySgt's Avatar
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    Feb 2010
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    Middle TN, displaced Okie
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    764

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    My 96 only had 1 airbag actually with those cupholders. Only way I can tell the 95 and 96 apart without popping open the hood was to look at the redline. 4500 on the 350 TBI and 5k on the Vortec 350. No clue on the 305s though. I don't mind gearing down when pulling a load, but that thing will struggle to pull 5,000+ lbs at highway speeds.

    My Camaro is a 73. Progress has been pretty slow lately though.
    93 Suburban (Southern Slayer): TBI 350, 4L60E
    73 Z28 Camaro: L82, TKO 600

    KJ4CLI



    "...Death smiles at us all, all a man can do is smile back..."

  2. #12
    Jr. Apprentice
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    Apr 2009
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    Minocqua,Wisconsin
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    20

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    Wow wish my 09 would get that I'm lucky to get over 20 on the highway. Mixed is between 15 and 16.
    Greg-Wisconsin
    2009 Suburban lt2

  3. #13
    Sr. Apprentice
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    Sep 2012
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    North Las Vegas
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    58

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    I just drove to and from St David, AZ from Las Vegas, NV and I got great gas mileage in my 4x4 z71 burb. How is that possible I get better gas mileage in this vehicle than in my S10 blazer? It's so awesome to get that kind of mileage so both me and the wife were impressed.
    What do you have in your garage?
    02 Burb Z71/97 Blazer LT
    Nuttin but bowties!!!!!!!!!!!!!
    Joshua T

  4. #14
    Jr. Mechanic blackburb's Avatar
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    Nov 2008
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    In Da U.P. of MI - - M Go Blue!
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    117

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    Quote Originally Posted by SupplySgt View Post
    My 96 only had 1 airbag actually with those cupholders. Only way I can tell the 95 and 96 apart without popping open the hood was to look at the redline. 4500 on the 350 TBI and 5k on the Vortec 350. No clue on the 305s though. I don't mind gearing down when pulling a load, but that thing will struggle to pull 5,000+ lbs at highway speeds.

    My Camaro is a 73. Progress has been pretty slow lately though.
    Have you checked the timing recently? My '94 4x4 with 3.42 and 157k was a gutless turd until I found the timing was retarded almost 13 degrees. Now it pulls my 30' Jayco (6000+ loaded) no problem at all. The difference was like going from a v6 to a v8. I was shocked how out of time it was and still have no explanation for how it got that way.

  5. #15
    Master Mechanic SupplySgt's Avatar
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    Feb 2010
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    Middle TN, displaced Okie
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    764

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    Quote Originally Posted by blackburb View Post
    Have you checked the timing recently? My '94 4x4 with 3.42 and 157k was a gutless turd until I found the timing was retarded almost 13 degrees. Now it pulls my 30' Jayco (6000+ loaded) no problem at all. The difference was like going from a v6 to a v8. I was shocked how out of time it was and still have no explanation for how it got that way.
    You know that actually makes sense. It pulls fairly hard from 2500-3500 RPM but below that is totally gutless. I would still like to at least go Tuned Port at some point (the 305 TPI puts out the same power as my TBI and the 350 TPI is way more powerful. But this could at least help out in the meantime.

  6. #16

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    i think this is the main reason
    245/75 R16
    those are small tires dude lol

    big tires look awesome but you sure pay for them.... =(
    did '05 start that selective clynder BS? or is that newer?
    Gas was $1.83 when Obama took office.....

  7. #17

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    Quote Originally Posted by PantheraUncia View Post
    I am a little skeptical also, but since I got my tuner and the OBD II diagnostic tools for android and I have been watching a few things, you are going to get your best fuel econ if your RPM's don't go over 1500 depending on the gear you are in, so there is something to be said for not using a lead foot

    Unfortunately most people are going to do allot of high speed acceleration or deceleration and they will be driving 65-75mph so they won't realize that high a MPG rating on their 5.3L engines. And I don't mean flooring the pedal, you don't have to do that to get your RPM's over 1500.

    They are talking about raising parts of the inner city freeways in our area to 70mph. You won't catch me going 60mph when that happens.
    Depending on your gear ratio in your axles, you can't always get under 1500rpm though. In my old silverado with 3.42 gears and the 4.8 engine, I would run about 1800rpm at 65-70mph. To go the same speed in my Avalanche with 4.10 gearing, I'm well over 2000rpm. Mix that with a heavier truck and 4x4, and I'm lucky to get 20mpg between 65-70mph. In the silverado I once got 25mpg on the uphill part of a trip through the mountains, averaging about 75mph. Both of those are with the same 20" rims and both with a performance tune. In the winter, it's a different story though for both. Grippier tires, cold weather, and winter blend gas sure cut it down.

    BUT, with the added weight of my truck, the 5.3 has extra power to balance it out over the 4.8 and the 4x4 shouldn't cause that much of a decrease, so I think gear ratio and the increase in rpm at any speed has a huge effect on fuel economy. It also changes the performance drastically. With 4.10 gears, the avalanche is better off the line and better for towing than the 3.42s in my silverado, but when I go to pass people on the highway I don't have the power with the 4.10s. The silverado with a 4.8 and 3.42 gears would run 100mph+ in second gear and pass people now problem with quick highway acceleration. The Avalanche with 4.10 gears is slow to accelerate on the the highway and takes more time to pass people.

    2008 FORD F350. My new all-around truck.
    2001 Silverado Reg. Cab Not-So-Base -- SOLD
    2003 Avalanche Z71. No Cladding. Check out my Mod thread. - Crashed. Will be rebuilt soon.
    1974 Triumph Spitfire 1500 - Work in Progress
    2003 Sierra 3500 Duramax. The Newer, Better Work Truck -- FOR SALE


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