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Mar 25th, 2012
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6.0 vortec help #7171473
05/16/18 05:47 PM
05/16/18 05:47 PM
Joined: Jan 2012
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Grayson County
EasyMoney Online content OP
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Grayson County
I have a 2015 Chevy 2500 with the 6.0 gas motor and when I bought it early last year it did good for fuel mileage but here in the last few months itís been getting worse. Iíve changed the oil and filters the same as I always have changed air filter when needed. Nothing is different and it went down bout 2mpg. Dealer cheacked it out and nothing is wrong. I have a good relationship with the dealer so I trust them. The service manager told me to go check out some tuning and do a intake and exhaust and itíll help a lot. Has anyone went that route? Any good timers that could be recommended would be a great start

Re: 6.0 vortec help [Re: EasyMoney] #7171582
05/16/18 07:56 PM
05/16/18 07:56 PM
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Lincoln Tx
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I find that buying fuel at name brand locations seem to make a difference for me. I have bought at an off the wall location before for need and could tell the difference in the mileage. Of course it all probably comes from the same place.

Re: 6.0 vortec help [Re: EasyMoney] #7171660
05/16/18 09:43 PM
05/16/18 09:43 PM
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Forney, Tx
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When I had my 2004 2500HD with the 6.0 the best I saw was 14, that was 1 trip. Every other tank was 12.5.

It could also be the weather and fuel mixtures. All my diesels get better MPGís during the summer due to higher outdoor temps and no winte blend fuels.

It should be the opposite for gas motors, better fuel economy during the winter, but thatís just my observation.


Originally Posted By: bill oxner
Ever spit it out rather than swallow it?

Originally Posted By: pegasaurus
Enjoy it while you can. One day you might be complaining about NOT getting random pop-ups in the morning. grin
Re: 6.0 vortec help [Re: EasyMoney] #7171686
05/16/18 10:40 PM
05/16/18 10:40 PM
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Grayson County
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I typically only get gas at 2 stations so the fuel itís self shouldnít be the issue but the warmer temps I guess could be part of it. Iíve only had diesels for the last 7 years and I got tired of the maintenance and not ďneedingĒ a diesel so I went to a gas rig but when I first bought it I was seeing 14 mpg and got 17 mpg on a trip to Louisiana but now Iím seeing 12 mpg and I drive 90 miles a day of pretty open highways without traffic. Guess I may look at a tuner or something cause that 2mpg is going to add up once the summer hits and we start traveling. Wish I could talk myself into buying a gas saver but I hate little cars

Re: 6.0 vortec help [Re: EasyMoney] #7171830
05/17/18 01:25 AM
05/17/18 01:25 AM
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Have you recently added a bumper, steps, tires, headache rack etc? Does it sound like the cooling fan is running all the time? Iíve had to replace a few GM fan clutches and they will hurt your fuel mileage.

How many miles on it? May clean the MAF.

Last edited by redchevy; 05/17/18 01:28 AM.

It's hell eatin em live
Re: 6.0 vortec help [Re: EasyMoney] #7171859
05/17/18 01:57 AM
05/17/18 01:57 AM
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Lincoln Tx
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Very good point redchevy. I went up one size in tires a few years back and it made a difference.

Re: 6.0 vortec help [Re: EasyMoney] #7171970
05/17/18 06:30 AM
05/17/18 06:30 AM
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Grayson County
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Iíve got 42,xxx miles on it and itís still got the same set of Michelin Tires on it that came on it and I added a frontier front replacement bout 6 months. I donít really notice the fans kicking on anymore than normal

Re: 6.0 vortec help [Re: EasyMoney] #7172081
05/17/18 01:21 PM
05/17/18 01:21 PM
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Add on bumpers etc. will affect your fuel mileage.

I would clean the MAF and throttle body and see if it improves.


It's hell eatin em live
Re: 6.0 vortec help [Re: EasyMoney] #7172266
05/17/18 04:38 PM
05/17/18 04:38 PM
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North Side of the Metromess
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chalet Online content
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Sudden drop in MPG or gradual? I'd dump a can of Seafoam per 7 gallons of gas in your tank and run it through. Maybe change the fuel filter after, see if that helps. They don't call it tuneup in a can for nothing... New plugs may help too but it seems early. Start with easy things before you try tuning or exhaust, unless you just want to go that route. If it was getting good mileage with the stock setup should be able to get it back without the extra mods.


Last edited by chalet; 05/17/18 04:39 PM.

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Re: 6.0 vortec help [Re: EasyMoney] #7172308
05/17/18 05:25 PM
05/17/18 05:25 PM
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I wouldn't do an intake or exhaust mod, you will never get the return on it.


It's hell eatin em live
Re: 6.0 vortec help [Re: EasyMoney] #7172528
05/17/18 10:08 PM
05/17/18 10:08 PM
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Prosper , TX
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You would be surprised how much a replacement bumper will hurt fuel mileage. I pulled a small trim piece off under my front bumper and I'm pretty sure that knocked my fuel mileage down 1 or 2 MPG. Just remember that $8,000 you saved buying a gasser. That will buy a lot of fuel. And your engine will be more reliable than almost every diesel on the road.

Re: 6.0 vortec help [Re: EasyMoney] #7172539
05/17/18 10:20 PM
05/17/18 10:20 PM
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denton,tx
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sweetwilliam Offline
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I run the same setup when I notice a drop I will add some Techron,itís a chevron product! I have some customers that run it in every tank!

Re: 6.0 vortec help [Re: EasyMoney] #7172697
05/18/18 01:10 AM
05/18/18 01:10 AM
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Forney, Tx
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Just had a thought. Are you using your AC now?


Originally Posted By: bill oxner
Ever spit it out rather than swallow it?

Originally Posted By: pegasaurus
Enjoy it while you can. One day you might be complaining about NOT getting random pop-ups in the morning. grin
Re: 6.0 vortec help [Re: EasyMoney] #7172810
05/18/18 02:27 AM
05/18/18 02:27 AM
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San Antonio
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You can disconnect your battery overnight to reset the computer and it may return to old fuel settings.


Just like Jesus, sometimes you gotta kill some hogs.
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Re: 6.0 vortec help [Re: EasyMoney] #7172813
05/18/18 02:33 AM
05/18/18 02:33 AM
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Lincoln Tx
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Are you actually checking your mileage or going by the computer on the vehicle? Iíve actually never checked mine manually but when Rattlesnkake Dan posted Iím thinking I need to really check mine.

Re: 6.0 vortec help [Re: EasyMoney] #7172885
05/18/18 04:21 AM
05/18/18 04:21 AM
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Grayson County
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I calculate every fill up thatís how I noticed it. Itís been more of a gradual thing then all at once. The front bumper was put on awhile before I noticed the drop in fuel mileage. Iíve ran some Lucas through it but not seafoam or Techron. Idk just kinda weird it started doing this. I typically donít run my a/c unless the wife and son are with me I just go with the window down year round except when itís stupid cold. Iím not really wanting to do the mods cause it runs good I wouldnít mind a little extra power when I haul stuff but I can live with the way it runs now. Iíll try the seafoam or Techron and see if that helps. Just thought Iíd ask if anyone else saw the same thing I know these 6.0 trucks are very common and good trucks so figured there would be some insight on what could be the issue.

Re: 6.0 vortec help [Re: EasyMoney] #7172904
05/18/18 06:56 AM
05/18/18 06:56 AM
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DFW
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Hasn't been mentioned yet, but check the pressure in your tires. Slightly deflated tires can impact your mileage as well.

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