Jump to content

2014+ Gas Mileage (MPG) Topic

BringTheRain403
 Share

Recommended Posts

  • Replies 1.6k
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Natek
Natek

I think if I was a salesmen I would research the products I would be selling. I wouldn't like it if a customer came in knowing more than me.

nibael
nibael

Mine gets pretty bad mileage at 180 mph. Maybe I should get a bed cover.

Eddie 70
Eddie 70

This was taken last week when I filled up. So far I have put this many miles on the truck. Hopefully it stays like this. We will see.  

Posted Images

timmyltr Enthusiast

timmyltr

Posted
Posted

Im surprised about the MPG posted, i expected better than that! certainly not enough to justify switching my 11 denali for a 14 denali 5,3! my 6.2 average 18 mpg gallon on highway, i thought it sucks but really not that bad after all!

BringTheRain403 Senior Enthusiast

BringTheRain403

Posted
  • Author
Posted

Oh wait you have the jacked up white Silverado with 4.56 gears. That makes more sense now lol

 

Sent from my SCH-I535 using Tapatalk 2

 

 

2014Z71LTZ Enthusiast

2014Z71LTZ

Posted
Posted

Seen a lot of talk on here about MPG going south after the recall update, i noticed the same thing but after thinking about this some more maybe its just more of the cold weather bad MPG. I got my recall done early January about the same time as the temps have really falling off in most of the country. I drive the same drive everyday one way to work 15 miles. In the summer months I was getting 20 MPG all the time, once the colder fall months came around I was is getting about 18 MPG, now since it has been colder than hell (beginning of January) I'm only getting 16 MPG. Also with the temp never going above 20 around here for the last month, on my 15 mile trip the water temp won't hit the 210' mark until I am almost to the end of the trip. I really think the crappy MPG is just due to the extreme cold.

redwngr Senior Enthusiast

redwngr

Posted
Posted

Im surprised about the MPG posted, i expected better than that! certainly not enough to justify switching my 11 denali for a 14 denali 5,3! my 6.2 average 18 mpg gallon on highway, i thought it sucks but really not that bad after all!

Take one for a test run and make the comparison the same way you check your current ride.

timmyltr Enthusiast

timmyltr

Posted
Posted

Take one for a test run and make the comparison the same way you check your current ride.

i did with a 14 slt 5,3, i saw 1-2MPG better. But way down on power!! The new Denali didnt got me all excited anyway. I think ill stick with my 10 denali for another year and then ill take another look.

pm26 Senior Enthusiast

pm26

Posted
Posted (edited)

Can't you request that they reset the system to the previous settings, i.e. undo the update (at least temporarily) and then see if the mileage improves? At least you would eliminate this as the root cuase if something else is causing it.

 

I have hard time understanding how can some small software update severely reduce the fuel economy unless someone really messed with the fuel mapping and ignition timing advance.

Edited by pm26
Ton J Enthusiast

Ton J

Posted
Posted

They had a recall on fuel pump calibration that why they had the first update 13330. Then the 14008 update fix remote start problem which caused the exhaust to over heat and the they cancelled the 13330 updated and replaced it with a new updated. I Asked my GM dealer about and they just go with what GM Tech tells them. I told them its my truck I would like a better understanding of these updates seeing that GM really not explaining them to much.

Ton J Enthusiast

Ton J

Posted
Posted

Can't you request that they reset the system to the previous settings, i.e. undo the update (at least temporarily) and then see if the mileage improves? At least you would eliminate this as the root cuase if something else is causing it.

 

I have hard time understanding how can some small software update severely reduce the fuel economy unless someone really messed with the fuel mapping and ignition timing advance.

Safety Hazard because of the fire from over heating. so they won't roll back the updates

Ton J Enthusiast

Ton J

Posted
Posted

 

This is exactly what the hell happened to me, no joke when from 16-18 to 11-13 after my freaking updates. I'm going in Saturday for my rear window recall and I am going to raise hell.

What dealership?

zback Enthusiast

zback

Posted
Posted

Oh wait you have the jacked up white Silverado with 4.56 gears. That makes more sense now lol Sent from my SCH-I535 using Tapatalk 2

 

 

Correct Sent from my iPhone using Tapatalk

I don't understand how you think you would be getting great fuel milelage with those mods you have?

BringTheRain403 Senior Enthusiast

BringTheRain403

Posted
  • Author
Posted
They had a recall on fuel pump calibration that why they had the first update 13330. Then the 14008 update fix remote start problem which caused the exhaust to over heat and the they cancelled the 13330 updated and replaced it with a new updated. I Asked my GM dealer about and they just go with what GM Tech tells them. I told them its my truck I would like a better understanding of these updates seeing that GM really not explaining them to much.

 

The 14008 recall incorporated the 13330 recall into it. It's just software updates. It's kind of like when windows does one big service pack instead of installing a bunch of little software patches they do one big one...

 

Sent from my SCH-I535 using Tapatalk 2

 

 

Ton J Enthusiast

Ton J

Posted
Posted (edited)

I get the vapor thing, but it still doesn't explain why my 2012 Silverado got better gas mileage and I getting 18-19 in it summer and winter. And it switched from V8 to 4.

Sound everybody just wants to just to it GM word on it.

post-127624-0-04813500-1391412833_thumb.jpeg

post-127624-0-04813500-1391412833_thumb.jpeg

post-127624-0-04813500-1391412833_thumb.jpeg

post-127624-0-04813500-1391412833_thumb.jpeg

Edited by Ton J

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,903
    Total Members
    8,960
    Most Online
    RyGuy43
    Newest Member
    RyGuy43
    Joined

  • Who's Online   5 Members, 0 Anonymous, 460 Guests (See full list)

  • Latest Articles

  • Posts

    • AlVeron
      Manufactuer's Defect - Paint Failure - Cherry Red High Country 2021 Suburban

      By AlVeron · Posted

      This is NOT impact damage nor neglect. There were previous class action lawsuits because of such paint preparation st GM manufacturing plant. Not just the Cherry Red Color. This paint is applied in three processes to obtain the desired color.  The manufacturer will cover for 36 months or 36k miles only. That rust is actually corrosion because of the paint process failure. Corrosion is covered for 100,100 miles or a certain months. However their corrosion doesn't include this type. Go figure. Clearly manufacturer knew from previous paint issues. This started 3 weeks ago out of the blue.  
    • richard wysong
      Wow I'm in a pickle. (Broke down truck) and a story.

      By richard wysong · Posted

      Is it time to put a piece of tape over the CEL? 
    • davester
      2015 Silverado 3500 right rear turn indicator failure

      By davester · Posted

      consider doing electrical testing?  I would guess some power or ground wire/connection has a problem.   alldata.com has wiring diagrams, connector pinouts and diagnostic procedures you can use to find where the problem is.
    • davester
      My First Project and GMC has me stumped

      By davester · Posted

      can you tell if the reader is actually trying to get codes, and the pcm is reporting none, or is your reader just silently failing because it's not communicating with the pcm?
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Any joy with this truck seems to be short-lived.   The CEL for P0172 ("bank 1" too rich) is now "intermittent".   I'm not sure where to check, or re-check, and my energy to keep chasing problems with junk is wearing thin. The P0172 seems to set as I'm coming to a stop, completely off the throttle, when fully warm. At least, that's what it's done the 3? times it's set.   Everything appears normal on the scanner EXCEPT long term fuel trim. There's only one bank on this vehicle because it's an OBD 1.5 with only one upstream O2 sensor. At idle, it's around -16.4% and will dip to -18% occasionally at idle or off-throttle. LTFT approaches 0 when throttle is held at 2500rpm. Short term appears normal, much closer to zero all the time. The LTFT tells me the engine is running rich at idle but compensating at higher load. But, why?   The EVAP purge valve doesn't appear to be leaking/sucking fuel vapor continuously. Is it sticking just as I come to a stop and the engine is choking on fuel vapor and sets the P0172? But that doesn't explain the persistently negative LTFT. Disconnecting the purge valve doesn't seem to make any difference.   I suppose that leaves another dang issue with the fuel injector. A leaking fuel pressure regulator, a new leak in the spider, or a leaking fuel injector/poppet valve I didn't see, or a small crack in one of the spider legs.   The vacuum line leading to the fuel pressure regulator doesn't have raw fuel in it. It doesn't even smell like fuel when it's pulled off, not until you suck air through it, then you can tell it leads to a fuel component. I'd consider that normal? Nothing is signaling this is a FPR issue from the outside, at least.   The oil smells like fuel but it's not building volume. I've noticed most oil in most engines smells like fuel to some degree so it's hard to say if the smell is an issue or not. Or if the engine just still smells like fuel because the crankcase was full of it a few hundred miles ago. But it's been changed twice since that original issue of the leaking fuel line dumping fuel into the intake.   Patience is running very thin. Every win seems to be accompanied by two steps backwards, or another issue that leads to removing at least the top half of the intake manifold. Enough! LOL

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...