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10-15-2018, 03:22 PM
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#1 |
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Registered User
Join Date: Apr 2016
Location: saginaw Mi.
Posts: 70
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gas mileage
I am sure it has been ask BUT 2001 HD 8.1, is this normal....8 miles to a gallon? I could live with 10 but 8 dang
Truck only has 66000 miles on it and yes it has the allison with 4/11 gears Any advise thanks |
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10-15-2018, 09:22 PM
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#2 |
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Senior Member
 
Join Date: Oct 2009
Location: Godley, TX
Posts: 17,975
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Re: gas mileage
I just drove from MN to TX and averaged 12.5-13 mpg every single fill-up.
My only difference from your config is 3.73 gears, and that does make a difference. 3.73 was standard for your config, 4.10 optional. |
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10-16-2018, 08:11 PM
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#3 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: gas mileage
mmm...2006 Silverado, 5.3...4WD....
gets 17 average across entire vehicle life.... drops a little if I tow my 24 ft tri axle enclosed toy hauler... but 8 !!!!! give ma a break !
__________________
Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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10-17-2018, 10:31 AM
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#4 |
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Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,405
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Re: gas mileage
It might be worth the effort to take it to someone that can check all the specifics in the engine tune.
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10-17-2018, 10:41 AM
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#5 |
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Moderator
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
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Re: gas mileage
2005 2500HD 6.0 4L80E NP263HD 4x4 4.10 axles and 265/70R17 tires. 12 rural 2-lane 14 interstate.
3.73 would definitely give me better mileage but the 1" larger tires help some. The 8.1L with 4x4 and 4.10 axles along with stock 245/75R16 tires will not do well on fuel. I'd expect 8-10 city and maybe 10-12 highway if you're lucky. It'll pull like an ox team tho.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. Last edited by hatzie; 10-17-2018 at 10:48 AM. |
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10-26-2018, 05:01 PM
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#6 | |
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Registered User
Join Date: Jan 2007
Location: Mississippi
Posts: 2,122
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Re: gas mileage
Quote:
 Yes, that's normal ... have a buddy with 8.1 2500 Suburban 4.11 and that's what it gets too. Was jealous of them at first for being able to find a 8.1 Sub, our 2500 Sub is a 6.0, until I realized the difference in MPG.
__________________
'72 C to K20 "Cannibalizer" http://67-72chevytrucks.com/vboard/s...32#post8653432 '85 K30 "Big Nassy" [B]'85 C10 [B] "Corpse" '01 2500 Suburban ...party wagon & tow truck '06 Silverado SS...DD '06 C1500 WT...DD '07 Classic C1500 WT...DD Built & sold cause can't keep 'em all: '72 Blazer "The Bucket" http://67-72chevytrucks.com/vboard/s...d.php?t=433190 '55 Chevy straight axle gasser https://www.trifive.com/forums/showthread.php?t=173938 '69 Pro Street Chevelle http://www.chevelles.com/forums/showthread.php?t=332541 '86 M1031 CUCV http://67-72chevytrucks.com/vboard/s...d.php?t=553619 |
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