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Discussion Forum

Chevy 6.0 gas fuel milage HELP

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Justin SE IOWA

02-02-2012 19:19:43
166.182.3.223



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I have a 2004 silverado 2500HD with 95,000 miles. It has a 6.0 gas engine. I bought it a few months back. It gets about 11 mpg on the highway and pulling a 2 horse trailer its about 6. I have a tonnu cover on it and I drive the speed limit; sometimes under it! What else can I do to get better MPG? Maybe a different air intake system? I need some help/advice. Thanks in advance.




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doug in illinois

02-03-2012 17:09:13
173.233.168.68



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
I also have one. It will make 16.5 to 17 going down the interstate at 70-75 MPH.

On the 2 lane roads it will max out at about 14 driving 55. Mine has too shallow gears in it, it runs best and cheapest once it hits overdrive and is not lugging.

Pulling any trailer bigger than a pickup box size trailer will drop it below 10 MPG. It makes about 6 MPG with either my 4 big bale mover or 100 small bales behind it. It makes about 7.2 with a 4 horse trailer with living quarters being pulled.

I have a "Superchips" tuner that I will tune it with if going a long distance. Doesn't help the MPG more than about 1/2 or 1 MPG, but does help the shift points, maybe taking some of the load off the transmission. It firms them up. DOUG

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Rick kr

02-03-2012 08:51:00
198.208.159.17



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
Justin,
I have ran a bunch of the 6.0L combos. 3.73 axle, 13mpg on the highway 11 or so around town.

4.10 axle, 11mpg, 10 around town. They'll pull almost anything, short of the duramax.

IIRC your towing capacity is around 3,000 more with the 4.10 gear.

3.73 RPO GT4, 4.10 RPO GT5, Locker G80

Rick



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rustyfarmall

02-03-2012 08:25:08
216.248.71.224



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 Re: Chevy 6.0 gas fuel milage HELP in reply to iajake, 02-02-2012 19:19:43  
Well, after reading all these replies, I don't feel too bad. I've got an '01 K3500 with the 8.1, 6 speed manual, and 4.10 axle that gets anywhere from 8 to 14. Usually will do about 10 mpg hooked to a loaded trailer, and 11 to 12 running empty without a trailer.



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Casey in Ky

02-03-2012 07:10:16
139.76.64.65



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
I've got an 2006 ext cab, 4wd 2500, 5 speed manual, with the 4.10 or 4.11(whichever they used) gears. It's got about 74000 miles on it. 14 mpg if I drive like grandma, 12 mpg under normal circumstances, 10 mpg if I'm heavy footed, and about 8 mpg towing 10k to 12k lbs. I've not really check mpg in the last 15k miles or so though, probably need, might be getting time for a tune up.

Truck never runs out of power, and that says a lot because I live in hill country. I bought the truck with about 47k miles on it, previous owner had a a little larger tires put on it, 265's, which I kinda like. He also added a flow master 40(the least nosiest one they make) and a K&N filter. I'm not a fan of either. I like a quiet truck. Don't know if they help mpg's or not but they are probably going to get removed just as soon as I get around to it.

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mkirsch

02-03-2012 05:55:51
64.80.110.74



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
What is the differential gear ratio? (i.e. 4.10)

What size tires? (i.e. 33" mudders)

What else is in the truck? (i.e. 500lbs of tools)

Chips, exhausts, intakes... Each might give you a fractional increase in economy, but you need them all to make an appreciable difference, and together they cost thousands of $$$. You will never recoup the cost of these "upgrades" in fuel savings.

11MPG running empty is a little low, but you'll spend thousands throwing parts and mechanic time at it trying to chase down the "problem."

You might actually be driving TOO SLOW. If you're lugging the engine to stay at or below the speed limit, it will use more gas than if you let it wind up a little more and get into its power band.

It's cheaper to just put the gas in it and live with it as long as it is running fine and has good power. You can't even come out ahead trading it in on something more fuel efficient.

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Chester5731

02-03-2012 05:44:15
75.144.92.98



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
One time I was real lucky with mine and it got 14. Normal driving 12, hook on a trailer 10. But I have never run out of power either. I bought it to work it and that is what it does.



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TonyIN

02-03-2012 05:26:40
74.215.182.169



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
Have a 04 2500 crew cab 4x4. 6.0 Like said in another post, careful highway driving gets me 14 or a little better. Flat land driving I can do better, but don"t see much of that here in the southern part of the state.
When buying this truck (used), I intentionally shopped for the 3:73? rear end - I think that"s the number. Either way, didn"t want/need the 4:10 as my needs are more for the weight carrying than the towing. So if you have the 4:10 that sounds about right to me. Coast when you can, use the gas only if necessary... I do that a lot too.

Good Luck

Tony

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Spook

02-03-2012 04:30:11
75.45.64.222



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
I get about 12 or 13 loaded or not, I don't track it too well. I just figure a 2500HD 6.0L truck isn't gonna get very good milage. I am selling mine soon, sold my trailer this last fall, don't need a big truck anymore. Plan on selling a Tahoe, the pickup, and buying a new 1500 chevy truck. I need a truck occasionally, but I don't need 3 vehicles, I have been putting only 1K per year on the old truck lately.

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doubleN

02-03-2012 03:37:07
74.45.19.158



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
I have a 2002 2500HD with a 6.0.

Careful driving at 60 mph on a highway gets me 14 mpg.

Careful driving around town gets me about 10 mpg.

However--it does haul my trailer and tractors up and around and over everywhere WITH EASE---and that's why I got it instead of a Toyota Prius.



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gene bender

02-03-2012 02:57:11
67.55.226.231



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
Hello you buy a 3/4 ton with a big engine and you want better gas mileage. what did you expect??



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Fawteen

02-03-2012 02:27:45
72.73.105.250



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
I get about 14 running empty with mine in a '07 GMC K2500HD, and got as high as 15 pulling an empty trailer on the interstate.

I don't use it much (it just rolled over 20,000) but when I need it, I NEED it so I live with the mileage.

Tried doing the job with a smaller truck with a smaller engine (4.7 Dakota) and the towing mileage wasn't any better and I never felt safe from a handling/stopping point of view.

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2x4

02-02-2012 22:45:27
75.106.107.236



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
get the Bosch spark plugs with the non-adjustable 4-electrode design. pricey A $50 but they guarantee 2 mpg or your money back. Worked for me exactly as they said (2000 2500 6L).



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Casey in Ky

02-03-2012 07:13:32
139.76.64.65



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 Re: Chevy 6.0 gas fuel milage HELP in reply to 2x4, 02-02-2012 22:45:27  
Are these the plugs you are referring to? I've never been much on "special" plugs but they really add 2mpg's and are guaranteed, then it's time for a tune up.

http://www.boschautoparts.com/sparkplugs/Pages/PlatinumIrFusion.aspx



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JDseller

02-02-2012 21:46:01
208.126.196.144



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
They all are fuel hogs. There are three or four right around me and none of them get over 13 mpg, two get under 10 mpg empty 6 pulling a trailer. They pull good and hold up well but are fuel hogs. That is why you see them for sale all over the place. A friend in the car business, says that they will bring $5000 less than the same truck with a 5.3.

Local guy here spent $6500 on his installing "better" air breather system, a "high" performance exhaust, and plus a different engine chip. He now gets 15 MPG. WOW that was really worth the $6500 dollars.

Your choices are to either live with the low mileage or trade it in on something that gets better mileage. There is a reason that the diesels bring more money.

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504

02-02-2012 21:19:41
64.111.61.44



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  

Low speed rear end, good for pulling bad om MPG.



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6.0 litre

02-02-2012 20:03:28
68.149.42.239



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
Unfortunately the 6.0 litres are gas hogs. They have good power but use way too much gas. Considering they're 366 cu. inches, they sure use a lot more gas than the old 350's. Maybe a chip would help and a good tune up?



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buickanddeere

02-03-2012 05:23:36
209.240.114.221



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 they use less in reply to 6.0 litre, 02-02-2012 20:03:28  
For those gripping about the 6.0L's mileage. Anybody recall the 4-5 mpg the gutless 350's and 400's had in the 1970's 4x4 pickups? It takes power to push a large vehicle and trailer through the air, put your hand out the window some time. It takes power every time to accelerate away from every stop sign and traffic light. To make power and engine has to burn fuel.



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Stuart

02-03-2012 06:46:06
166.181.3.155



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 Re: they use less in reply to buickanddeere, 02-03-2012 05:23:36  
My BILs gets 10 mpg. What type of trailer are you hauling it on to get that type of mileage. A 454 ran that kind of mileage in those days, not the small blocks.



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low budget

02-03-2012 06:27:28
74.39.160.240



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 Re: they use less in reply to buickanddeere, 02-03-2012 05:23:36  
Yep, dad had a 75 Chevy K20 with a 350 and full time 4wd. Gutless and 8 mpg no matter how you drove it.



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rustred

02-02-2012 19:56:54
74.200.18.156



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
need to get a 5.3L way easier on full. went through 2 company vehicles with 6.0L and both were hard on fuel . got a new one now with a 5.3L and big big diff. about 150 miles more to the tank. just that this one is a half ton.



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atlarge54

02-02-2012 19:35:42
75.105.128.54



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
Saddle up a horse and ride. That is of course if hay isn't too high priced in your area.



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buickanddeere

02-02-2012 19:31:07
209.240.114.221



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 Re: Chevy 6.0 gas fuel milage HELP in reply to Justin SE IOWA, 02-02-2012 19:19:43  
It's on the low but acceptable side of normal. My 6L, 4x4 crew cab with brush bar and cap gets 13mpg just knocking around on short trips to town or to work. Any big tires or low tire air pressure? Re-programmed mine to change the shift points.It wanted to stay in 2nd gear unless going down hill.



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VicS

02-02-2012 20:04:24
166.250.106.186



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 Re: Chevy 6.0 gas fuel milage HELP in reply to buickanddeere, 02-02-2012 19:31:07  
My neighbor has one, he gets 10. Had it back to dealer they said nothing was wrong. Vic



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