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  1. #31

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    My 2011 Sierra 2500HD Crew 6.0 4WD has 1200 miles on it and getting about 13mpg according to the driver control panel. hoping to improve this. any suggestions for the 2011 6.0?

  2. #32
    Jr. Apprentice
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    Northern California
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    My 2002 Z71 Silverado LS 4X4 with stock sized 265/75/R16 on stock aluminum wheels would get an average of 13.5 mpg with about 50% city and 50% hwy driving. The best I ever got was 18.6 mpg driving to L.A. from NorCal at around 85 mph average. It never really has gotten great gas mileage compared to GM's claims and I've often wondered if there was something wrong with my particular truck. I will say however that my truck is VERY quick compared to others I've driven, and since I'm aware that every factory vehicle is different, I'd be willing to bet that my 327 is pumping out a few extra HP compared to most others of the same year. I think a Hypertech chip is in my future...it may help, it may not, but I'm into tinkering...

  3. #33
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    Quote Originally Posted by BigBill View Post
    The best I ever got was 18.6 mpg driving to L.A. from NorCal at around 85 mph average. It never really has gotten great gas mileage compared to GM's claims and I've often wondered if there was something wrong with my particular truck
    18.6 mpg at 85 MPH average is really good Bill, considering that GM does it's MPG checks around 55-65MPH.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  4. #34

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    my dually 1 ton burb gets 12 avr. 50/50 and with the diesel swap will be at 20-25 MPG. We did 4 of them already and 1 box truck and its proven !!!!
    cant wait to swap my own engine..lol

    BTW, for all you 6.2 & 6.5 diesel truckers ..there is no reason not to get a min..of 20 MPG in your trucks after we tune and upgrade them.

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC
    WE CAN STICK A DIESEL IN ANYTHING
    SPECIALIZED IN CUSTOM CONVERSIONS OF ANY KIND
    Scott:glasses:

  5. #35
    Jr. Apprentice
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    Jan 2011
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    Northern California
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    Well I had no idea 18.6 was good. I hear all these guys brag about 20 to 22 mpg and it irritates me.

    OK, so this past weekend, after installing the 285's I ran the truck up to Reno and back (round trip 199 miles) and ended up putting 10.7 gallons in it when I got back to top it off. That averages out to 18.59 mpg. The drive to Reno has a lot more hills and turns and braking than the drive to LA, so i'm figuring that I may have actually improved my mpg by putting these larger tires on. Also, and many of you may think I'm way off here but I SWEAR to this, my truck handles BETTER after turning up the torsion bars. It take the mtn roads better and my power band also changed. Where I was lagging and my truck was up and down shifting randomly at around 60 to 65 mph (around 2000 rpm), it now runs at 72 mph at 2000 rpm and when I step on it it seems to downshift faster and pull better. Can putting larger tires on and cranking up the torsion bars really do ALL that at once? It feels like a different truck...a BETTER truck.

  6. #36

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    BigBill

    Well I had no idea 18.6 was good. I hear all these guys brag about 20 to 22 mpg and it irritates me.


    NO way they get more then 19....if they do they go 20 MPH all the time.... lol
    I think 18.6 is actually A LOT !

  7. #37
    Legend

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    Stephan is dead on(as usual)18 mpg with a V-8 truck at 85mph IS SPECTACULAR!!!
    Spectacular for ANY V-8 truck, but especially spectacular for a 6.0 3/4 ton(maybe 4x4) truck.
    My guess is you had VERY FAVORABLE winds on that LA/NorCal trip. In the SW and West winds can blow pretty hard( hot air rises and cool dense air from the Pacific fills in under it). The Pacific usually is the same temp(cool) so during summer days air rises inland as the land warms and winds blow inland.Your mountain ranges can funnel this wind all sorts of odd ways.
    In general a 3/4 ton 6.0 should get about 15 mpg at 60-65 mph. In the city maybe 10-12 mpg once warmed up if there aren't too many redlights.In general Mild Hypermiling will make your truck get Crossover type mpg. mid teens city, low 20's hy.
    Most 6.0 folks get about 12 mpg in mixed driving.
    I'm a mpg nut.
    About all you can do to improve hy mpg is slow down. City mpg improves if you glide-stay off the freakin brakes. MPG nuts(hypermilers) call it Pulse and Glide(P&G).
    Charlie

    PS-Daredevil is right. It borders on impossible to average 20 mpg in mixed driving with any V-8 pickup/SUV. Now you can get 20 mpg on pure HY trips by staying at 60-65 mph.The 5.7 and 5.3 are very efficient and 60-65 mph. If you drive like a Hypermiler you can get 16-18 mpg city, but normal mixed city-lotta red lights-you get about 10-13 mpg.
    I get 20-21 mpg- averaging about 62 mph- on long hy trips- 1998 Suburban 2wd 5.7. I get about 13 mpg city and I'm driving to get good mpg- wife ruins my average- it would be 15 mpg if she would stay out of the Suburban(just use Prius0.
    Large heavy vehicles can do OK at steady low Hy speeds, but city...... not so much- it took GM a zillion $$ and a $8000 price premium to get 20 mpg city with their 2 mode hybrids. So it is possible, but not easy or cheap.
    Charlie
    Last edited by phoebeisis; 02-16-2011 at 05:41 AM.
    1998 suburban-
    1/2 ton

    199500 miles
    River
    Ridge,LA

  8. #38

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    Quote Originally Posted by phoebeisis View Post
    Stephan is dead on(as usual)18 mpg with a V-8 truck at 85mph IS SPECTACULAR!!!
    Spectacular for ANY V-8 truck, but especially spectacular for a 6.0 3/4 ton(maybe 4x4) truck.
    My guess is you had VERY FAVORABLE winds on that LA/NorCal trip. In the SW and West winds can blow pretty hard( hot air rises and cool dense air from the Pacific fills in under it). The Pacific usually is the same temp(cool) so during summer days air rises inland as the land warms and winds blow inland.Your mountain ranges can funnel this wind all sorts of odd ways.
    In general a 3/4 ton 6.0 should get about 15 mpg at 60-65 mph. In the city maybe 10-12 mpg once warmed up if there aren't too many redlights.In general Mild Hypermiling will make your truck get Crossover type mpg. mid teens city, low 20's hy.
    Most 6.0 folks get about 12 mpg in mixed driving.
    I'm a mpg nut.
    About all you can do to improve hy mpg is slow down. City mpg improves if you glide-stay off the freakin brakes. MPG nuts(hypermilers) call it Pulse and Glide(P&G).
    Charlie

    PS-Daredevil is right. It borders on impossible to average 20 mpg in mixed driving with any V-8 pickup/SUV. Now you can get 20 mpg on pure HY trips by staying at 60-65 mph.The 5.7 and 5.3 are very efficient and 60-65 mph. If you drive like a Hypermiler you can get 16-18 mpg city, but normal mixed city-lotta red lights-you get about 10-13 mpg.
    I get 20-21 mpg- averaging about 62 mph- on long hy trips- 1998 Suburban 2wd 5.7. I get about 13 mpg city and I'm driving to get good mpg- wife ruins my average- it would be 15 mpg if she would stay out of the Suburban(just use Prius0.
    Large heavy vehicles can do OK at steady low Hy speeds, but city...... not so much- it took GM a zillion $$ and a $8000 price premium to get 20 mpg city with their 2 mode hybrids. So it is possible, but not easy or cheap.
    Charlie
    The best we seen so far, was 32 MPG avarage in a custom Cummins Diesel Burban. The 6.5's are somewhere between 20-28 MPG avr. On both pulling 12K # did not matter at all.
    But i agree 100% with your above post on Gassers.

  9. #39
    Sr. Engineer Aeropagus's Avatar
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    Quote Originally Posted by DAREDEVIL View Post
    The best we seen so far, was 32 MPG avarage in a custom Cummins Diesel Burban. The 6.5's are somewhere between 20-28 MPG avr. On both pulling 12K # did not matter at all.
    But i agree 100% with your above post on Gassers.
    Wow, that's pretty impressive though. 32 MPG.
    John ~ New Mexico ~ It's all about the bowtie!
    2007 GMC Envoy & 2010 GMC Sierra

  10. #40

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    Ive gotten 18.89 with my 2005 Suburban with 3.42s on a 450 mile trip with a semi-loaded truck

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