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  #1  
Old Posted 04-19-2005, 11:20 AM
turbo_bu turbo_bu is offline
 
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8.1L Vortec Gas Mileage?

Been looking at getting a 3/4 ton Suburban with an 8.1L for towing with. Unfortunately, I am a little bit leary of just "how bad" the gas mileage will be. A friend of mine has a Duramax and gets pretty good mileage, but GM doesn't put the Dmax in Suburbans yet

Also, if you have some experience with the 8.1L, are you using the 3.73 or 4.1 rear end?
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  #2  
Old Posted 04-19-2005, 11:51 PM in reply to turbo_bu's post "8.1L Vortec Gas Mileage?"
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Brisk Brisk is offline
 
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I worked with a guy who had a cc lb truck with that engine and he sold it to get a diesel because the milage was so bad. I think like 6-8 mpg around town but he has a heavy foot. I think in a burb 10mpg city is possible, but again this isnt 1st hand experiance.

-Brent
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  #3  
Old Posted 04-20-2005, 02:03 AM in reply to Brisk's post starting "I worked with a guy who had a cc lb..."
DWitcher DWitcher is offline
 
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My neighbor has a 2001 Chevy 3500 4x4 with the 8.1 and in town its 9mpg unloaded 12mpg on the freeway unloaded and pulling 10,000lb bumper pull he says the best was 11mpg on the interstate. The thing pulls like a freight train!
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Old Posted 04-20-2005, 11:04 AM in reply to DWitcher's post starting "My neighbor has a 2001 Chevy 3500 4x4..."
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502_Jimmy 502_Jimmy is offline
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Quote:
Originally Posted by DWitcher
My neighbor has a 2001 Chevy 3500 4x4 with the 8.1 and in town its 9mpg unloaded 12mpg on the freeway unloaded and pulling 10,000lb bumper pull he says the best was 11mpg on the interstate. The thing pulls like a freight train!
Thats about what my 8.1L 2500HD got. I never got 11 towing though... more like 7-8mpg.

John
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2003 Chevy DA EC/SB 4x4 ~
SCIII - EFILive - SD Twin Pumps - SD Manifold - AFE Stage II - Kennedy 4" Exhaust - Red Optimas
SD Sleeves/Centerlink - Green Keys/1.5" Block, - AR Pythons - 295/75/16 BFG AT - Bilsteins - HID Lows - Kennedy Headlight Harness - 65W Fogs - Ranch Hand Rear Bumper - LEED Eng. Front Hitches

2004 Suburban Z71 ~ 2005 Nissan Armada LE
1983 GMC Jimmy ZZ502 ~ 1988 Chevy K5 ZZ4
1987 Chevy K5 HT383 ~ 1983 K10 364ci 578RWHP
1995 Chevy K2500 454tbi ~ 1989 GMC C2500 330HP Vortec
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  #5  
Old Posted 04-20-2005, 01:17 PM in reply to turbo_bu's post "8.1L Vortec Gas Mileage?"
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RJF's Red Cummins RJF's Red Cummins is offline
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Quote:
Originally Posted by turbo_bu
but GM doesn't put the Dmax in Suburbans yet
And unfortunately, they never will.

Quote:
Also, if you have some experience with the 8.1L, are you using the 3.73 or 4.1 rear end?
I would take 3.73's. The slightly higher ratio would promote a little better mileage on the highway and the power of the engine would be plenty to pull most loads you would find behind a Suburban.
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  #6  
Old Posted 04-21-2005, 11:07 AM in reply to RJF's Red Cummins's post starting "And unfortunately, they never will. ..."
turbo_bu turbo_bu is offline
 
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Thanks for the feed back guys.... I have also been reading some other information that the 8.1L used to (still does?) have an oil consumption problem. Anyone else heard of this?
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  #7  
Old Posted 04-21-2005, 02:33 PM in reply to turbo_bu's post starting "Thanks for the feed back guys.... I..."
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RJF's Red Cummins RJF's Red Cummins is offline
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I've heard of it and have even heard of one guy that went through a quart every 1K.
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  #8  
Old Posted 04-22-2005, 08:09 AM in reply to turbo_bu's post starting "Thanks for the feed back guys.... I..."
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502_Jimmy 502_Jimmy is offline
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Quote:
Originally Posted by turbo_bu
Thanks for the feed back guys.... I have also been reading some other information that the 8.1L used to (still does?) have an oil consumption problem. Anyone else heard of this?
Mine went through only a qt in 3k-3.5k miles. I attributed this to the large displacement..
__________________
2003 Chevy DA EC/SB 4x4 ~
SCIII - EFILive - SD Twin Pumps - SD Manifold - AFE Stage II - Kennedy 4" Exhaust - Red Optimas
SD Sleeves/Centerlink - Green Keys/1.5" Block, - AR Pythons - 295/75/16 BFG AT - Bilsteins - HID Lows - Kennedy Headlight Harness - 65W Fogs - Ranch Hand Rear Bumper - LEED Eng. Front Hitches

2004 Suburban Z71 ~ 2005 Nissan Armada LE
1983 GMC Jimmy ZZ502 ~ 1988 Chevy K5 ZZ4
1987 Chevy K5 HT383 ~ 1983 K10 364ci 578RWHP
1995 Chevy K2500 454tbi ~ 1989 GMC C2500 330HP Vortec
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  #9  
Old Posted 05-07-2005, 06:00 PM in reply to 502_Jimmy's post starting "Mine went through only a qt in 3k-3.5k..."
Resqpink Resqpink is offline
 
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I've got an '03 Suburban 2500 4x4 w/33s. We get 10mpg in town, 13.5 unloaded hwy (this is all sea level, 80 mph). Predator programmer boosted mpg @1.5. And yes, it pulls like crazy! It's hard to believe an aerodynamic brick will move like this thing does! Just bought an f-250 diesel for better mileage, but it's not nearly as fast in stock form. Mine burns a quart of oil every 2500-3000 miles.
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  #10  
Old Posted 02-17-2011, 09:12 PM in reply to Resqpink's post starting "I've got an '03 Suburban 2500 4x4..."
thehurtster thehurtster is offline
 
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Location: fair grove missouri
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I have a 2001 Silverado 3500 with 8.1L and a allison trans with 4.10 gears.It gets 11.5 empty and 8 loaded.And yes they pull like crazy. I would like to learn more about that predator programmer that gained 1.5mpg.
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