Jump to content

6.0 vs 6.6 fuel economy?

David03hd

Recommended Posts

David03hd Enthusiast

David03hd

Posted
Posted

I did a search and didn't seem to find if anybody had asked this question already. With all things being equal how does the diesel compare to the gas engine in fuel economy? I realize when someone wants a vehicle like this, its usually not an issue. Kind of like buying a muscle car, but I was curious as to the opinions on this.

  • Replies 49
  • Created
  • Last Reply
David03hd Enthusiast

David03hd

Posted
  • Author
Posted

Duramax can get 14-17 MPG City and 17-21 MPG Highway

17 to 21 hwy seems great to me for a 6.6. way better than I assumed.

travishale84 Enthusiast

travishale84

Posted
Posted

diesels generally get better mpg's than gas PROVIDED you keep the turbos from spooling like crazy (good luck). 6.0's get about 8-10, maybe 14 on a good day

AgDoctor Senior Enthusiast

AgDoctor

Posted
Posted

Most people who buy the diesel does so for the torque. Duramax will hold a gear on most gradual hills.

 

Sent from my Galaxy Nexus using Tapatalk 2

 

 

doverarjim Senior Enthusiast

doverarjim

Posted
Posted

I can pull up my history on my 99, 2500 Ext cab 6.0 and tell you that over the time I owned the truck from 16,000 miles to 186,000 miles my average loaded and unloaded mileage was 13.887234. Since January 1, 2012 with my 11 2500 CC 4 X 4 my average loaded and unloaded mileage is 14.312302. I will say that the first two years on my diesel I have more towing mileage that I did in most of the years with the 99. Also let me say that towing with the 11 is almost a pleasure, not many white knuckle climbs and down hill runs. :jester:

David03hd Enthusiast

David03hd

Posted
  • Author
Posted

Im surprised of how much lower the gas is compared. I actually thought the numbers would be reversed.

doverarjim Senior Enthusiast

doverarjim

Posted
Posted

I have made only one trip that I can say was the same with both trucks and the difference on that trip was the 99 got 8.4 mpg on a 1800 mile trip and the 11 pulling the same trailer got 13.5 mpg. The difference is 170,000 miles over 10 years to only 21,000 miles in 2 years. I think over time the diesel will get to be a greater difference that what I am seeing right now.(or at least I hope):jester:

Ramin258 Enthusiast

Ramin258

Posted
Posted

2011 3500 sierra, 6.0l gas, cc, 4x4, 4.10 gears. I average 15 hwy, 12 city. 8-9 with my 7000lb 5th wheel. All stock. Last tank, hand calculated 13.64 mpg combined driving.

David03hd Enthusiast

David03hd

Posted
  • Author
Posted

2011 3500 sierra, 6.0l gas, cc, 4x4, 4.10 gears. I average 15 hwy, 12 city. 8-9 with my 7000lb 5th wheel. All stock. Last tank, hand calculated 13.64 mpg combined driving.

I could live with 15. That's what my 2000 5.3 is getting now. I see your from Wixom, My father in-law use to work at the ford plant years ago and there always seems to be something fun to do at he convention center. Thanks for the info

MORSNO Enthusiast

MORSNO

Posted
Posted

Are you looking for a new truck or an older model? The new updated 6.0's with the 6 speed transmission (2011+) are getting better mileage than previous models. With my 2012 GMC SLT 2500 6.0, I get 12.5 city and 15 hwy. The new diesels getting lower city mileage and have frequent regens but pull heavy loads with ease compared to the older models. Most guys don't need a diesel and the extra maintenance costs unless they haul heavy loads on a regular basis.

rotti Enthusiast

rotti

Posted
Posted

"The new updated 6.0's with the 6 speed transmission (2011+) are getting better mileage than previous models. With my 2012 GMC SLT 2500 6.0, I get 12.5 city and 15 hwy."

 

I have about the same truck only with a 1,500 lb pop up camper on full time.

I have been seeing 12 city and 14 to 15 highway IF I'm gentle on the throttle.

David03hd Enthusiast

David03hd

Posted
  • Author
Posted

Are you looking for a new truck or an older model? The new updated 6.0's with the 6 speed transmission (2011+) are getting better mileage than previous models. With my 2012 GMC SLT 2500 6.0, I get 12.5 city and 15 hwy. The new diesels getting lower city mileage and have frequent regens but pull heavy loads with ease compared to the older models. Most guys don't need a diesel and the extra maintenance costs unless they haul heavy loads on a regular basis.

I'm patiently waiting for my new 2013 to arrive. It sounds like if I'm good I should see 15 with a 6.0. I debated about the diesel but with me using it a couple of months out of the year for plowing and towing two snowmobiles it just isn't making a whole lot of sense to change my mind and reorder with a diesel.

MORSNO Enthusiast

MORSNO

Posted
Posted

I'm patiently waiting for my new 2013 to arrive. It sounds like if I'm good I should see 15 with a 6.0. I debated about the diesel but with me using it a couple of months out of the year for plowing and towing two snowmobiles it just isn't making a whole lot of sense to change my mind and reorder with a diesel.

 

You'll see 15, it is not uncommon with the new 6.0's. I also use mine for towing snowmobiles and ATV's depending on the season. I plan on getting a slide in camper some day for the summer ATV months, that is why I decided on a 2500 over my previous 1500's. I could not see any reason to buy a diesel for my use and don't need to overcompensate to feel tough...lol. The new diesels get better mileage when empty, but drop fast under load, so I couldn't see spending more for the truck, fuel, maintenance, insurance, etc.

David03hd Enthusiast

David03hd

Posted
  • Author
Posted

You'll see 15, it is not uncommon with the new 6.0's. I also use mine for towing snowmobiles and ATV's depending on the season. I plan on getting a slide in camper some day for the summer ATV months, that is why I decided on a 2500 over my previous 1500's. I could not see any reason to buy a diesel for my use and don't need to overcompensate to feel tough...lol. The new diesels get better mileage when empty, but drop fast under load, so I couldn't see spending more for the truck, fuel, maintenance, insurance, etc.

Sounds like you and I are on the same page. I use my 2000 1500 to plow (fisher ezv) the installer said don't do it, I said go ahead and its worked great but now I just thought since I'm in the market for a new truck I might as well get something with a heavier front.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,866
    Total Members
    8,960
    Most Online
    Greg3160
    Newest Member
    Greg3160
    Joined

  • Who's Online   5 Members, 0 Anonymous, 437 Guests (See full list)

  • Latest Articles

  • Posts

    • MANGOAL
      Mangoal or FitcamX OEM Dashcam?

      By MANGOAL · Posted

      Late reply, but yes—it works on the SLT trim. Compatibility comes down to the plastic shroud shape behind your mirror, not the trim badge itself. On the SLT with auto-dimming, it uses a plug-and-play Y-harness off the mirror/rain sensor power, so no need to run wires down to the OBD port. If anyone's ever unsure about fitment, just drop a photo of your mirror housing and we can double-check it.   Appreciate the detailed feedback on the install! On the windshield glare—we actually took feedback like yours and developed a dedicated CPL (polarizer) filter to cut down dash reflections on sunny days. If you're still running the cam, shoot me a DM. I'd be happy to send a CPL filter over for you to test out—no charge. 
    • davester
      2002 GMC Yukon

      By davester · Posted

      There are no stickers in your glovebox?
    • davester
      Weight limit in bed

      By davester · Posted

      Look at the numbers on the stickers in the door jam...
    • EJS2015
      Actual Full Screen CarPlay on Refreshed Silverado/Sierras.

      By EJS2015 · Posted

      Yes, every time the developer updates his code, you must recompile. I will private message you with the latest because it changes pretty much with every version.
    • Grumpy Bear
      Transmission Temperature Hitting 220s

      By Grumpy Bear · Posted

      After I wrote that reply I went for a ride. 85 F out. So trans started at 85 F and it shifted the same as it did an hour latter at 168 F. I've never actually recorded the to cold to shift point but it is under 32 F before they start hanging on to a lower gear or leaving the converter unlocked. Both intended to heat fluid.    Yes, brake or bake. Absolutely.      Your welcome. True research ended decades ago. Field trials are still in play.    There is a thing called oxidation onset temperature. This is the heat related oxidation not the O2 exposure kind. For mineral oil that starts at 140 F. So what happens after 140 F? Each 20 F cuts fluid life in half! Does using a Full Synthetic improve that? Yes! By how much? Depends on the base oil type and a few other factors. But enough to notice. Some esters are even higher. There are even synergies between types the will raise it higher than any one component is alone.    Then there is "Hindered" oils. Antioxidant additives. Hindered Polyol Esters can sit at 500 F for years in a turbine.   When a blender brags his oil will 'take 500 F" in service he doesn't specify for how long. Water will dance on a 500 F hot plate for several seconds. @newdude put up a chart showing the relationship between fluid temperature and it's life in an automatic transmission. Here's a version of that chart for Group III based oils. These temperatures are those in the pan as observed as 'normal'. that is you drive as you do for as long as you do under what load you ask of it and whatever that temperature is this graph applies to. Flash temperatures of a few minutes isn't what his means.    Note that fluids held at a constant 240 F have a service life of only 20K miles. 220 F explains the factory exchange limit, eh? My equipment I keep under 180 F and I'm good if the cooler will hold it as low as 140 F. But that's me.   

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...