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  1. #11

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    Another Update : I increased the tire pressure to 70 psi. I use 87 Octane and filled up at the same pump friday night, drove 157 miles (mainly highway) round trip back to the same pump and filled her up = 9.333 gallons.
    157 / 9.333 = 16.822 MPG.
    This is NOT taking into consideration that my odometer is off 1/2 tenth per "measured" mile. So for every 10 miles registered on the odometer, I have actually traveled 10.5 miles. So ACTUAL MILES would equal 157 x .05 = 7.85. 157 + 7.85 = 164.85 / 9.333 = 17.66 MPG HIGHWAY.

    Who believes air pressure doesnt make a difference???
    Last edited by undertheradar; 11-28-2011 at 08:41 AM.

  2. #12

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    Quote Originally Posted by undertheradar View Post
    Another Update : I increased the tire pressure to 70 psi. I use 87 Octane and filled up at the same pump friday night, drove 157 miles (mainly highway) round trip back to the same pump and filled her up = 9.333 gallons.
    157 / 9.333 = 16.822 MPG.
    This is NOT taking into consideration that my odometer is off 1/2 tenth per "measured" mile. So for every 10 miles registered on the odometer, I have actually traveled 10.5 miles. So ACTUAL MILES would equal 157 x .05 = 7.85. 157 + 7.85 = 164.85 / 9.333 = 17.66 MPG HIGHWAY.

    Who believes air pressure doesnt make a difference???
    Another update:
    This has only happened 2x since 11-28-11. I wonder if ever so often I get "good" gas???
    I am still looking into a programmer or going to someone who has the program to input the correct tire size in the computer. The shift points are off a hair and I know its hurting my mileage. It "hangs" in 5th gear too long. I dont know ANYTHING about the programming.... I will need help

  3. #13

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    Get the Hypertech speedo cali. Well worth the money IMO.

    ________2013 4C Rated__________


  4. #14
    Sr. Mechanic
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    Mar 2010
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    Auburn, Alabama
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    You might want to rethink your high psi strategy just to save on gas, you will be running the centers out of those tires wayyyyyyyyyyyyyyyyyy prematurely!!! Is having to replace expensive tires sooner, not only having to pay the price of the tires, but also installation, is it worth it?

    Just my thinking.

    07 Silverado 1500 5.3L extended cab
    4" Rancho Suspension lift with Adjustable Shocks
    2" Leveling kit
    1.5" Zone Offroad body lift
    35x12.50 R 18 Nitto Trail Grapplers
    Ranch Hand Grille Guard
    Ranch Hand Rear Bumper
    Tow mirrors
    Color matched grey/silver Bushwacker fender flares
    Dual exhaust from cats back with X pipe coming out 5" tips
    Black Tool box
    Edge CTS Programmer
    Proliner Spray in bedliner
    20% tint all the way around

  5. #15

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    Quote Originally Posted by alabamaxrebel View Post
    You might want to rethink your high psi strategy just to save on gas, you will be running the centers out of those tires wayyyyyyyyyyyyyyyyyy prematurely!!! Is having to replace expensive tires sooner, not only having to pay the price of the tires, but also installation, is it worth it?

    Just my thinking.
    The tires are rated for 80 psi...

    ---------- Post added at 06:32 PM ---------- Previous post was at 06:30 PM ----------

    Quote Originally Posted by ajarman View Post
    Get the Hypertech speedo cali. Well worth the money IMO.
    Looking at them as I type this. I have also come across a DiabloSport Predator for $288 http://www.truckaddons.com/Catalog/s...ort_tuners.htm
    Which one is the better buy? The H/T is $229 and is only a code reader and speedo calibrator.

  6. #16
    Sr. Mechanic
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    Mar 2010
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    Auburn, Alabama
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    For towing..................... Might want to research it a little. Probably shouldn't be more than 40 psi in those tires to wear correctly..... But I'm just saying, I can guarantee if you went to a tire shop they would tell you that you are going to wear the center of your tire out extremely prematurely.

    07 Silverado 1500 5.3L extended cab
    4" Rancho Suspension lift with Adjustable Shocks
    2" Leveling kit
    1.5" Zone Offroad body lift
    35x12.50 R 18 Nitto Trail Grapplers
    Ranch Hand Grille Guard
    Ranch Hand Rear Bumper
    Tow mirrors
    Color matched grey/silver Bushwacker fender flares
    Dual exhaust from cats back with X pipe coming out 5" tips
    Black Tool box
    Edge CTS Programmer
    Proliner Spray in bedliner
    20% tint all the way around

  7. #17
    Sr. Engineer marko54's Avatar
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    Sep 2010
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    N.E. wisconsin
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    [QUOTE=undertheradar;441071]The tires are rated for 80 psi...

    ---------- Post added at 06:32 PM ---------- Previous post was at 06:30 PM ----------


    I bet it handles horrible with that much air pressure. Alabamamxrebel is right about center tread wear. Also when driving in the rain or snow you wont have full tread pattern contact with the road which means lousy bad weather handling. I run 59 PSI in the rear and 53 Psi cold in the front in my Duratracs. My Suburban 2500 is leveled. i get a constant 13.5 city and avg. 18 hiway up to 20.5 mpg. I run the Edge CS tuner on the economy mode and i keep my foot out of it and still have plenty of power with the 6.0
    2007 Suburban 2500 Edge evolution CS leveled 265 goodyear Silent Armor Pro Grade Kenwood DNX6180 Nav.Radio





    OH Goody, another Pickem up truck dripping with Chrome Crap!

  8. #18
    Master Mechanic Jimmeh's Avatar
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    Apr 2009
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    Columbia Falls, Montana, United States
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    It's crazy seeing you guys are getting lower numbers. Even with my 33's and leveled, I was getting 21 on the highway and 17 average.
    2005 Chevy Silverado W/T
    4X4|4.8 with some mods (has only slightly more pull than a 5.3)|Auto|4 door ex cab|Cooper Discoverer AT/3's in 285-75/17's on Helo 842's|Cooper Discover M+S 265-75/17's on Devino DV349's|Flowmaster 40 Single in Dual out with custom bent pipe from the end of the cats back|2" Procomp leveling kit|Custom made center console|Custom dyno tunes|Air Raid CAI|Air Raid Throttle Body Spacer|Apex brand topper|Kenwood Head Unit with Kenwood speakers|Painted mirrors/grille|Debadged except front emblem|Bilsteins front and rear
    Planned mods not in order
    2 inch lift|Custom front/rear bumper|hitch tire carrier|roof basket on topper, bars on cab|finish center console build|install Midland CB|Power options|Tint|Custom made raised bed in the bed of the truck|Lund LunarVisor
    Also have a 1992 Ford Ranger with a lot of stuff done to it. Currently waiting for a bit of a rebuild.


    "The only woman I'm pimping from now on is Sweet Lady Propane. And I'm tricking her out all over this town."

  9. #19

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    why do people insist on putting in 80 psi all the time, come on now


    2003 GMC Sierra 1500 SLE 5.3
    Factory Tint
    Recon Taillights
    2.5 ReadyLift Leveling Kit
    Low Profile Toolbox
    Westin Nerf Steps

  10. #20
    Sr. Mechanic
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    Mar 2010
    Location
    Auburn, Alabama
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    1

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    Quote Originally Posted by BrownPats420
    why do people insist on putting in 80 psi all the time, come on now
    Agree! Might as well use stones for tires and take the suspension off!

    07 Silverado 1500 5.3L extended cab
    4" Rancho Suspension lift with Adjustable Shocks
    2" Leveling kit
    1.5" Zone Offroad body lift
    35x12.50 R 18 Nitto Trail Grapplers
    Ranch Hand Grille Guard
    Ranch Hand Rear Bumper
    Tow mirrors
    Color matched grey/silver Bushwacker fender flares
    Dual exhaust from cats back with X pipe coming out 5" tips
    Black Tool box
    Edge CTS Programmer
    Proliner Spray in bedliner
    20% tint all the way around

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