Jump to content

Gas mileage change/no "get up"

Jeremy Morphis

By Jeremy Morphis
in Troubleshooting & Recalls

Recommended Posts

Jeremy Morphis New Member

Jeremy Morphis

Posted
Posted

I have a 2015 Silverado 2500hd gas, 6.0

My truck has 30,000 miles. I have always gotten 16-18 mpg on the highway (70mph). The last week, I can't get above 9mpg on the highway (70mph), even going downhill. Also, may be my imagination, it seems that I have lost some power. The truck feels like I am pulling a trailer or have a heavy load in the back. Any ideas?

HeliMark Enthusiast

HeliMark

Posted
Posted

The first thing that comes to mind and doesn't cost much would be a new air filter. I could be wrong though, but just a thought.

Also add, is all the normal maintenance up to date. Fuel filter, plugs. See if any codes have been thrown. And last, maybe bad gas? Did this start just after a fill up?

 

Mark

 

Sent from my SM-G930U using Tapatalk

SouthpawHD Enthusiast

SouthpawHD

Posted
Posted

I would look at what the previous posters said, air filter and fuel filter.

 

If you are not sure what to do, you are under warranty so take it to dealer and have them double check some things.

newdude Senior Enthusiast

newdude

Posted
Posted

No fuel filter on these gas trucks. GM hasn't had an inline filter on gas trucks since 2004.

 

Any codes, check engine light, etc? I'd be taking it in to the dealer asap.

  • 2 weeks later...
GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted

I have a 2015 Silverado 2500hd gas, 6.0

My truck has 30,000 miles. I have always gotten 16-18 mpg on the highway (70mph). The last week, I can't get above 9mpg on the highway (70mph), even going downhill. Also, may be my imagination, it seems that I have lost some power. The truck feels like I am pulling a trailer or have a heavy load in the back. Any ideas?

Hi j-mo,

 

We see that you are seeking the input of other forum members, and would like to offer our assistance as well. If you would like to discuss your situation a little more in depth, please know that we are only a private message away. Our team would be more than happy to assist any way that we can.

 

Thank you,

 

Bret B.

GM Customer Care

Colossus Senior Enthusiast

Colossus

Posted
Posted

There is a fuel filter in the gas tank. It's part of the fuel sending unit. I doubt it would be the air filter. You'd be setting MAF sensor codes by the time a filter became plugged enough to cause issues with engine performance.

Colossus Senior Enthusiast

Colossus

Posted
Posted

Sounds like you got a bad tank of fuel. Run it down and then fill up with some good fresh fuel from a top tier station (if you don't already fill up there. Even they can get a bad delivery of fuel from the terminal, or something washes down into the underground tanks at the gas station) and maybe add a can of BG44k to it as well, I really like the stuff. I use it twice a year. Not only does my repair facility use it, but so does my dealer service department, made me smile when I saw a service advisor recommending it as well as a professional fuel system cleaning to a customer who had brought her 15 year old Saturn in for performance issues.

https://www.bgprod.com/catalog/gasoline-fuel-system/bg-44k-fuel-system-cleaner/

  • 3 months later...
1982 New Member

1982

Posted
Posted

Was this problem ever fixed? I've got the same issue. I've seen a few other people do too and no one has posted if they got it fixed. I'm gonna go to the dealer and have a backpressure test done. Don't know what else to do.

gearheadesw Senior Enthusiast

gearheadesw

Posted
Posted

What does it do, or not do? Just bad fuel milage? Any pinning, surging, coughing like it's running out of gas? Fill up with some premium gas now and see if it changes anything.

Archived

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

Go to topic listing

  • Latest Articles

  • Posts

    • mark249
      Help purchasing a touch screen digitizer

      By mark249 · Posted

      Brought my 2015 Colorado into the dealership to check my touch screen issues, had that ghost touch thing happening. They said I needed a new touch screen and they could either order me one for $500. The lady at the service deck was nice enough to tell me I could order a touch screen online for less, she did stipulate that the touch screen had to be factory OEM, you can't pair an aftermarket screen to my radio seeing it was 2015, it had to be a GM factory OEM only. I found a few on Amazon and Ebay by the numbers on the back of the old screen, DJ080PA-01A GM# 22740886, Some said "OEM" in the description and others just said "Replacement". Would a replacement be the same as a OEM as long as it had the same numbers on the back of the screen? In some of the descriptions they also show different brand names but same numbers, is that an issue?  
    • Donstar
      Navigating senior years.

      By Donstar · Posted

      I have both but typically use the 4 legged walker (wheels on front, ski's on back).   The four wheeler is starting to be used on "longer" outdoor walks.  The 4 legged walker is particularly helpful in practicing good walking posture.  Both of my knees are at different stages of recovery and I'm trying to not develop poor habits.  I can actually manage with a cane but it's very difficult not to favor one leg over the other.  My PT recommends I continue with my 4 legged walker for a while.  Yesterday was four weeks since my last knee replacement and I'm excited about my progress to date.  It has been a hell of a rough journey so far but it is exciting to witness  systematic and continuous improvement.  I went for years watching the decline of my "mobility".  It seems that everyday now I am alerting my wife to something I can do now that I couldn't a day or two ago!  I encourage anyone facing the prospect of knee replacement to share any concerns with others who have had the surgery.  It isn't an instant fix but rather is a considerable amount of short term pain for long term gain.  Recovery time and pain levels vary for individuals post surgery but the end results are typically very positive and I've never encountered anyone regretting having had the surgery. 
    • diyer2
      AFM Disabler Question

      By diyer2 · Posted

      The lifter issue can be dealt with by shorter oil changes and quality oil IMO.
    • diyer2
      Winter Returned

      By diyer2 · Posted

      Got heavy rain, hail and light rain yesterday. 
    • Core-Lokt
      Wiring Help, Please

      By Core-Lokt · Posted

      I'm putting in an A-pillar pod/gauges, and I'm asking if anybody can identify a (preferably) fuse for a switched power and illumination circuit on the driver's side interior fuse panel. Offhand, everything I checked with a test light was constant-hot, and I'd much rather uses a piggyback fuse. I can certainly find a wire, but I'd rather not half-tap.   Thanks in advance for any help.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...