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#13706945 - 04/01/19 Re: 5.3 fuel mileage [Re: Yondering]  
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Rock Chuck Online content
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Filer, ID
Originally Posted by Yondering
Originally Posted by Rock Chuck
The freeway speed limit here is 80. Between 75 and 80, mileage often drops a lot because cars with overdrives will drop out of OD at that speed. You're running 800 to 1000 rpm faster on the tach.


Are you speaking specifically about Chevy trucks with the 5.3, or just trying to make a general statement? That certainly isn't the case with our Suburban with the 5.3; it holds OD and TC lockup easily at 80 mph, even on mild hills. It averages 15 mpg.


That's in general. I have the problem with our van and I know a number of others with cars that can't cruise at 80 in OD.


If you work for a living, why kill yourself working?
Tuco
300 BP

#13707035 - 04/01/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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stantdm Offline
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My GMC Sierra 5.3 gets about 16.5 on the highway and 14.5 around town. Mine is a couple of years older than the one you are looking at and has 4:10 differentials.

#13707071 - 04/01/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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FatCity67 Offline
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Central Valley NorKal
5.3 LM7 Vortec in my 99' LS Silverado 4x4.

Has a few bolt on upgrades that really let it get down the road or up that grade towing.

Don't really worry about the gas mileage.

Been retired for about 15 years only has 130k

Oldest kid stole it one time to go to Coachella rock concert in 2009 and blew out the rear end racing it.

Love that girl, shes more like me than the other two. grin



Maybe we're all happy.
#13708228 - 04/02/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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Rooster7 Online content
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Minnesota
My 2015 Silverado averages 18 - 20 mpg depending. The best I've gotten is a little over 25 mpg on a drive to Bemidji.


The deer hunter does not notice the mountains


"I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve" - Isoroku Yamamoto



#13708560 - 04/02/19 Re: 5.3 fuel mileage [Re: Dirtfarmer]  
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Dillonbuck Offline
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Originally Posted by Dirtfarmer
Originally Posted by pete53
i buy a new chev silverado with a 5.3 every 2 years and most get over 16 -18 miles per gallon my 2017 gets 18-19 per gallon. but here`s the real kicker you pull a trailor and it goes down alot,with my 16 foot boat and trailer10-12 miles per gallon, pull my 14 ft. enclosed utility trailer pack with my elk equipment out west thru the mountains 4- 8 miles per gallon . i do always get the towing package too but if your going to pull alot of trailors with a 5.3 beware gas mileage is poor then. i always drive 70 miles per hour when legal but a 5.3 is a dang tuff engine and so is a Chevrolet truck.

Business partner replaced his 5.3 Surburban engine at 200K miles. Cost his $7K. He said that was better than $85K for a new one.

DF



Look into the cost of crate 5.3 engines.
If he paid $7k, he either upgraded from a stock setup, or he got ripped.
Maybe he went to a Chevy dealer and told them to have at it.


30-06 and/or Partitions. What was the question again?
People don't understand how hard it is to be cheap.
Alpha

#13709128 - 04/02/19 Re: 5.3 fuel mileage [Re: Dillonbuck]  
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Dirtfarmer Online content
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Central Louisiana
Originally Posted by Dillonbuck
Originally Posted by Dirtfarmer
Originally Posted by pete53
i buy a new chev silverado with a 5.3 every 2 years and most get over 16 -18 miles per gallon my 2017 gets 18-19 per gallon. but here`s the real kicker you pull a trailor and it goes down alot,with my 16 foot boat and trailer10-12 miles per gallon, pull my 14 ft. enclosed utility trailer pack with my elk equipment out west thru the mountains 4- 8 miles per gallon . i do always get the towing package too but if your going to pull alot of trailors with a 5.3 beware gas mileage is poor then. i always drive 70 miles per hour when legal but a 5.3 is a dang tuff engine and so is a Chevrolet truck.

Business partner replaced his 5.3 Surburban engine at 200K miles. Cost his $7K. He said that was better than $85K for a new one.

DF



Look into the cost of crate 5.3 engines.
If he paid $7k, he either upgraded from a stock setup, or he got ripped.
Maybe he went to a Chevy dealer and told them to have at it.

Chevy dealer did it. They’re good buds, partners in a jet.

DF

#13716130 - 04/05/19 Re: 5.3 fuel mileage [Re: Terryk]  
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bsa1917hunter Offline
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Orygun
Originally Posted by Terryk
http://www.fuelly.com/car/chevrolet...id=125&bodytype_id=&submodel_id=

On the home page select browse vehicles. Then input engine and options to get a survey.
I had a 2005 with 5.3, and I got 15 mpg, in rural/highway conditions. My best friend has a 2013, and he said a bit less, but he drives pretty aggressive.
I put 100K on mine, and it was always at the shop. Beside being expensive to maintain it was a nice commuter truck.



I was in the same boat with my 04 GMC 4x4. Beautiful comfortable truck, but many problems: I'll list as many as I can remember:

1. Front diff needed to be rebuilt soon after I bought it. Good thing it was under an extended warranty.
2. Transmission needed to be rebuilt. 4l60E is very weak and troublesome.
3. Transfer case started weaping, which is a very common problem in the autotrack type transfer case.
4. G80 locker went tits up at 111,000 miles.
5. Transfer case actuator went bad at 120,000 miles.

Gas mileage was worse than my wife's '99 suburban with the 5.7 litre engine. I was lucky to see 18 MPG with the 04 GMC sierra 4x4 with the LS1 5.3 on the freeway... When I got rid of the truck, the engine was still running like a top with no oil leaks and no oil consumption within its 5,000 mile oil change intervals. The engine was bulletproof, but the rest of the drive train sucked balls.....


Originally Posted by raybass
I try to stick with the basics, they do so well. Nothing fancy mind you, just plain jane will get it done with style.

Originally Posted by Pharmseller
You want to see an animal drop right now? Shoot him in the ear hole.
P


BSA
#13716209 - 04/05/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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ajmorell Offline
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Santa Fe, NM
FWIW, a '04 5.3 isn't an LS1 it's an LM7

#13769978 - 04/25/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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auk1124 Offline
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KY
Have a 2017 Silverado 5.3 4x4 in Work Truck configuration, with low gears and tow package, plus an aftermarket ODB port module that kills the fuel management . 90% of miles are in town. 13.8 mpg, consistently.

Crappy gas mileage but I love the truck, especially with the fuel management override.

#13770279 - 04/25/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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travelingman1 Offline
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Huntsville, Alabama
Have a 2006 GMC crew cab. Average 16.7 with about 2/3rds city driving.


You may not have lost all your marbles but there is definitely a hole in the bag!
Bravo

#13770836 - 04/25/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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Dirtfarmer Online content
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Central Louisiana
'04 Tahoe with 5.3, 19 on the hwy.

'11 Z-71 4WD, 5.3, 17.5 all around, mixed driving.

DF

#13771426 - 04/25/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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JGRaider Offline
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W. Texas
2018 LTZ Crew 4x4. With 26k on the odometer, I've averaged 17.6 combined. Cruising down the highway at 70mph will get me near 22 easy, 75mph around 20. All flat ground around here. Quietest, most comfy truck I've ever owned, and that's impressive since over the last 20 years our various small fleet has had them all.....F150's, Tundras, and Z71's. It runs circles around the 2015 Tundra Crew 4x4 it replaced.


There is nothing that enters a man from outside which can defile him; but the things which come out of him, those are the things that defile a man.
#13771460 - 04/25/19 Re: 5.3 fuel mileage [Re: JGRaider]  
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Dirtfarmer Online content
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Originally Posted by JGRaider
2018 LTZ Crew 4x4. With 26k on the odometer, I've averaged 17.6 combined. Cruising down the highway at 70mph will get me near 22 easy, 75mph around 20. All flat ground around here. Quietest, most comfy truck I've ever owned, and that's impressive since over the last 20 years our various small fleet has had them all.....F150's, Tundras, and Z71's. It runs circles around the 2015 Tundra Crew 4x4 it replaced.

I've had people tell me that the new Ford rode the best. I think you're right about Chevy, I like the way they drive and feel.

I've heard the Dodge (AKA Ram) has rear coil springs and rides really nice. I'm not interested enough to find out... blush

DF

#13771475 - 04/25/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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JGRaider Offline
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W. Texas
I've surmised over the years of using and driving them all, that the Ford is very tough and rides like a truck, the Chevy's have held up well and ride more like a car, and we have avoided the Dodge 1/2 T pu's like the plague, for good reason. The new Dodge looks great, but it's still a Dodge. The Tundras have bee great too, except for the latest one, the 2015. It had a cold start valve go out at 50k, and the nav/entertainment system went out twice before 75k. Not very bulletproof like they supposedly say they are. It's also a good idea to own a refinery if you get a fleet of Tundras......act fuel mileage was abysmal.


There is nothing that enters a man from outside which can defile him; but the things which come out of him, those are the things that defile a man.
#13771843 - 04/25/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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Whiptail Offline
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Austin, TX

My friend had 2012 Z71 extended cab and we would usually get around 17mpg on our trips to Colorado. He got rear ended last year and the insurance company totaled it so now his has a 2018, also with the 5.3. We haven't gone to Colorado so I don't know the mileage but he said it's a little better.



Quando omni flunkus moritati
#13772835 - 04/26/19 Re: 5.3 fuel mileage [Re: auk1124]  
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Dirtfarmer Online content
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Dirtfarmer  Online Content
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Central Louisiana
Originally Posted by auk1124
Have a 2017 Silverado 5.3 4x4 in Work Truck configuration, with low gears and tow package, plus an aftermarket ODB port module that kills the fuel management . 90% of miles are in town. 13.8 mpg, consistently.

Crappy gas mileage but I love the truck, especially with the fuel management override.

What does the fuel management override do? Doesn't look like it helps mileage.

DF

#13772899 - 04/26/19 Re: 5.3 fuel mileage [Re: Dirtfarmer]  
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auk1124 Offline
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KY
It stops the truck from cutting out four cylinders, leaving it constantly in eight cylinder mode.

Just a personal preference of mine. It does seem to help significantly (at least to my mind) with acceleration and torque. I never liked driving around a half ton pickup with four cylinders. Another thing it supposedly does is stop 5.3 engines from developing oil burning issues over time, but my truck is so new that has not been an issue.

Just my little personal rebellion against these crazy CAFE standards.

#13800741 - 05/07/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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duckster Offline
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We have 2 Silverados with the 5.3 motor all the time as ranch trucks, we trade them about every 2 years, so have owned/driven them often.

Generally all get about 19-21 mpg on the highway, depending on load/wind. My daily commute is 56 miles round trip, about 80% highway/20% city and the average is generally between 19.5-20 mpg. (I don't drive like a NASCAR racer)

Last edited by duckster; 05/07/19.
#13800827 - 05/07/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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travelingman1 Offline
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Huntsville, Alabama
2006 gmc Sierra crew cab 4wd. Get 19.2 hwy and about 13.5 city. Average since I have owned it (140K) is 16.7.

Wondering if anyone has used a chip or similar to improve fuel efficiency. If so, what results, good or bad. Thanks


You may not have lost all your marbles but there is definitely a hole in the bag!
#13801623 - 05/07/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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chesterwy Offline
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A good aftermarket exhaust and air cleaner will get you into the 21 MPG range on the highway.

#13823533 - 05/15/19 Re: 5.3 fuel mileage [Re: 79inpa]  
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dubePA Offline
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PA
2014 Silverado 1500 double cab, 4x4. Six speed auto, 3:73 gears. Averages around 20-22 MPG highway at 70 MPH. Third 5.3L GM 4x4 I've had since 2006. The only one that did worse on gas, was the 2010 w/3:05 gears and a four speed automatic. The 2014 is the best of the bunch.

When it was brand new and the bed wasn't piled half full of jacks, tools, heavy chains, etc. it hit a "best" of 24.3 MPG on the fuel mileage 'puter display back then. That was for about a 500 mile trip, including local driving at the destination and maybe 300+ miles of highway driving. Lost that display last year, when it was in for repairs to an air direction shutter behind the dash and they apparently disconnected the battery?

Best I've been able to rack up since, is 22.4..Truck averages 14 to 15 around town normally, goes down in the winter. Does not like really cold weather for fuel mileage. Creepin' up on 60,000 miles now, no complaints. Truck is also pretty damn quick from a dead stop.


If three or more people think you're a dimwit, chances are at least one of them is right.
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