fuel report - The 1947 - Present Chevrolet & GMC Truck Message Board Network

86c20 · 02-25-2013, 03:00 PM

ok guys went on a trip to NH to get a truck that i now dont want lol. but anyway i used my k30 6.2 loaded i got 9.8mpg with my foot to the floor the hole time. dam she needs more power lol.

what are you guys geting out of your trucks?

AntiGov · 02-25-2013, 06:28 PM

7.75 ....454.....empty.....i dont even wanna know what it is towing...

**hatzie** · 02-25-2013, 07:52 PM

Highway
1976 6.5 NA 5sp 4x4 17mpg 70mph
M1008 6.2 NA TH400 4x4 11mpg 55mph max
2000 6.5 TD 5sp 2wd 21mpg 70mph I've gotten 23 but it's an outlier typically she runs 20-21.

Town
1976 6.5 NA 5sp NP208 4x4 14mpg
M1008 6.2 NA TH400 NP208 4x4 9-10mpg
2000 6.5 TD 5sp 2wd 18mpg

LT265 70 R16 tires on all three
The CUCV has 4.56:1 axles... According to my spreadsheet... at 55mph she tachs out at 2100. That sounds about right. At 65 she should be turning 2600 and it sounds like the engine is trying to climb out from under the hood.

The other two have 3.73:1 axles. They tach out at roughly 2100 at 70mph.

I think the CUCV needs a 4L80.

86c20 · 02-25-2013, 08:32 PM

4l80e and a gear venders lol

meatwagon83 · 02-25-2013, 11:44 PM

i get about 10 with mine, 454 th400 3.73 one ton crew

83GMCK2500 · 02-25-2013, 11:50 PM

Just got 12.8 this weekend. Mostly highway, kept it under 65.

INSIDIOUS '86 · 02-26-2013, 12:17 AM

I am about 5-10 city and 13hwy cruising at 3krpm at 60mph
Posted via Mobile Device

dieseldawg142 · 02-26-2013, 12:43 AM

'85 crew, 454, t400, 4:56's, 38.5 swamps.$200-$220 to fill both tanks, 200 miles to empty both tanks. around 180 in town

meatwagon83 · 02-26-2013, 01:22 AM

Quote:

Originally Posted by dieseldawg142

'85 crew, 454, t400, 4:56's, 38.5 swamps.$200-$220 to fill both tanks, 200 miles to empty both tanks. around 180 in town

daggone man! i thought mine was bad at about 140 a tank

dieseldawg142 · 02-26-2013, 01:30 AM

ya, right now we're paying $1.29 a liter (frickin metric) & there's just over 4 liters in a gallon. same truck 15 yrs ago was $80-$90

INSIDIOUS '86 · 02-26-2013, 01:35 AM

I'm
At 50$ a tank in premium to fill at $3.97 a gal.
That's a good sack tap for you there
Posted via Mobile Device

D13 · 02-26-2013, 07:25 AM

Last summer I was getting 23mpg. 1987 R10 6.2 diesel NA 700R4 3.08. Mixed driving, 58 in country, 68 on highway, posted speed in city. Rear end is out right now and diesel is $4.25!

86c20 · 02-26-2013, 02:03 PM

diesel here is 472 a gal. and regualr gas is 472 or better a gal. in my 86 i get 200 miles a tank. witch comes out to be 14mpg with a top speed of 45mph. my 85 i get 200 out of it for 50 bucks almost. 50-60 bucks depending on what i do.

frog210 · 02-26-2013, 04:08 PM

In my 74 shortbed 31 in tires 305/350 trans I get 10mpg that's street, don't get on the highway, so not sure on that number...
Posted via Mobile Device

Low87 · 02-26-2013, 04:17 PM

89 TBI 350 K5, 700r4, 33x12.5x15, very tired 273k engine

full tank before last only netted me 9.62 mpg
filled up last night and came up with 11.66 mpg

No idea what was different. Prior to the 9.62 tank I'd overhauled the fuel system (new pump/sender/fuel filter/rebuilt TBI & new injectors)

I have a new EGR valve to swap in, hoping that will help me some.

I buy real gas, hovers over $3.60/gal here.

Your41Plague12 · 02-26-2013, 09:14 PM

6.24 in town, 11.2 HWY last time I checked. '83 K20, mild 355, TH400, NP208, 4.10 gears, 38x15.50 MT Baja Claw Radials.

Rubble · 02-26-2013, 09:51 PM

The 81 454/400/205/4:10 on 33s around 7-8. 82 6.2/A833/208/3.73 6" lift on 35s around 15-16 on highway this winter,86 350/465/208/4.10 7" lift on 35s around 10-11. Not sure about the old C20,wife drives it mostly,just keep filling it up!!!
Posted via Mobile Device

zook · 02-26-2013, 10:46 PM

don't want to know but seems as thought the 502 is always thirsty. just happy to have 2 tanks until it's time to pay..saw premium at $4.19 a gallon yesterday! still a fun ride when i drive it. may check some day.

GM-power · 02-26-2013, 11:30 PM

Ive never checked and probably won't. I know it's crappy so I just know I just put 20 bucks in at a time and that lasts about two days lol.
Posted via Mobile Device

02-25-2013, 03:00 PM	#1
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	fuel report ok guys went on a trip to NH to get a truck that i now dont want lol. but anyway i used my k30 6.2 loaded i got 9.8mpg with my foot to the floor the hole time. dam she needs more power lol. what are you guys geting out of your trucks? __________________ 1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car

02-25-2013, 06:28 PM	#2
AntiGov Registered User Join Date: Oct 2011 Location: central Oregon Posts: 1,225	Re: fuel report 7.75 ....454.....empty.....i dont even wanna know what it is towing... __________________ 88 3+3 454 400 205 410 drw to srw still in pieces 90 3+3 350 400 205 410 srw 84 1/2 ton lb 6.2 4x4 parts truck

02-25-2013, 07:52 PM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: fuel report Highway 1976 6.5 NA 5sp 4x4 17mpg 70mph M1008 6.2 NA TH400 4x4 11mpg 55mph max 2000 6.5 TD 5sp 2wd 21mpg 70mph I've gotten 23 but it's an outlier typically she runs 20-21. Town 1976 6.5 NA 5sp NP208 4x4 14mpg M1008 6.2 NA TH400 NP208 4x4 9-10mpg 2000 6.5 TD 5sp 2wd 18mpg LT265 70 R16 tires on all three The CUCV has 4.56:1 axles... According to my spreadsheet... at 55mph she tachs out at 2100. That sounds about right. At 65 she should be turning 2600 and it sounds like the engine is trying to climb out from under the hood. The other two have 3.73:1 axles. They tach out at roughly 2100 at 70mph. I think the CUCV needs a 4L80. __________________ 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... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

02-25-2013, 08:32 PM	#4
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	Re: fuel report 4l80e and a gear venders lol __________________ 1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car

02-25-2013, 11:44 PM	#5
meatwagon83 Registered User Join Date: Dec 2012 Location: Preble county ohio Posts: 1,914	Re: fuel report i get about 10 with mine, 454 th400 3.73 one ton crew

02-25-2013, 11:50 PM	#6
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: fuel report Just got 12.8 this weekend. Mostly highway, kept it under 65. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96

02-26-2013, 12:17 AM	#7
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: fuel report I am about 5-10 city and 13hwy cruising at 3krpm at 60mph Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

02-26-2013, 12:43 AM	#8
dieseldawg142 Registered User Join Date: Jul 2011 Location: back 40, bc Posts: 3,903	Re: fuel report '85 crew, 454, t400, 4:56's, 38.5 swamps.$200-$220 to fill both tanks, 200 miles to empty both tanks. around 180 in town

02-26-2013, 01:30 AM	#10
dieseldawg142 Registered User Join Date: Jul 2011 Location: back 40, bc Posts: 3,903	Re: fuel report ya, right now we're paying $1.29 a liter (frickin metric) & there's just over 4 liters in a gallon. same truck 15 yrs ago was $80-$90

02-26-2013, 01:35 AM	#11
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: fuel report I'm At 50$ a tank in premium to fill at $3.97 a gal. That's a good sack tap for you there Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

02-26-2013, 07:25 AM	#12
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: fuel report Last summer I was getting 23mpg. 1987 R10 6.2 diesel NA 700R4 3.08. Mixed driving, 58 in country, 68 on highway, posted speed in city. Rear end is out right now and diesel is $4.25! __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

02-26-2013, 02:03 PM	#13
86c20 Registered User Join Date: Mar 2012 Location: edgartown mass Posts: 852	Re: fuel report diesel here is 472 a gal. and regualr gas is 472 or better a gal. in my 86 i get 200 miles a tank. witch comes out to be 14mpg with a top speed of 45mph. my 85 i get 200 out of it for 50 bucks almost. 50-60 bucks depending on what i do. __________________ 1986 c20 "the hillbilly" 350 sm465 3.42gears 21mpg at 70mph 1985 k30 "the ice cream truck from hell" no rust az truck 197-8??? c30 "ramp truck" 454 1978 monte carlo 350 350th with 2.73 gears. no rust. sc car

02-26-2013, 04:08 PM	#14
frog210 Registered User Join Date: Mar 2012 Location: San Antonio, Tx Posts: 784	Re: fuel report In my 74 shortbed 31 in tires 305/350 trans I get 10mpg that's street, don't get on the highway, so not sure on that number... Posted via Mobile Device __________________ San Antonio, TEXAS -Frog -I'm a valet and well I've driven BMWs, Mercedes, Porsche,Bentlys, fiats, Hondas, etc and well even do I like a few features, I love my shortbed, it dosent bore me out, just press on the gas and you'll remember why you love it.

02-26-2013, 04:17 PM	#15
Low87 been here longer than Liz Join Date: Feb 2000 Location: Broken Arrow, OK Posts: 2,437	Re: fuel report 89 TBI 350 K5, 700r4, 33x12.5x15, very tired 273k engine full tank before last only netted me 9.62 mpg filled up last night and came up with 11.66 mpg No idea what was different. Prior to the 9.62 tank I'd overhauled the fuel system (new pump/sender/fuel filter/rebuilt TBI & new injectors) I have a new EGR valve to swap in, hoping that will help me some. I buy real gas, hovers over $3.60/gal here. __________________ ~Greg~ Mac's Garage '87 SWB 6/8 drop "Piso" '08 CCSB Silverado DD the departed '89 GMC K5 Jimmy 4x4 "Rusty Nuts" '77 Chevy K5 Blazer 2wd '83 Chevy stepside "You get what you pay for" - Mike 'swervin ervin' Ervin

02-26-2013, 09:14 PM	#16
Your41Plague12 Registered User Join Date: Dec 2010 Location: Pittsburgh, PA Posts: 1,009	Re: fuel report 6.24 in town, 11.2 HWY last time I checked. '83 K20, mild 355, TH400, NP208, 4.10 gears, 38x15.50 MT Baja Claw Radials. __________________ Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400



Register or Log In To remove these advertisements.

02-26-2013, 09:51 PM	#17
Rubble Registered User Join Date: Feb 2012 Location: Big Valley. Alberta Posts: 674	Re: fuel report The 81 454/400/205/4:10 on 33s around 7-8. 82 6.2/A833/208/3.73 6" lift on 35s around 15-16 on highway this winter,86 350/465/208/4.10 7" lift on 35s around 10-11. Not sure about the old C20,wife drives it mostly,just keep filling it up!!! Posted via Mobile Device __________________ 1977 Chev C30 454/465/14ff DRW 1974 Chev C20.350/465/14ff " Rock n Roll ain't noise pollution"

02-26-2013, 10:46 PM	#18
zook Registered User Join Date: Dec 2012 Location: overland park, ks Posts: 167	Re: fuel report don't want to know but seems as thought the 502 is always thirsty. just happy to have 2 tanks until it's time to pay..saw premium at $4.19 a gallon yesterday! still a fun ride when i drive it. may check some day.

02-26-2013, 11:30 PM	#19
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: fuel report Ive never checked and probably won't. I know it's crappy so I just know I just put 20 bucks in at a time and that lasts about two days lol. Posted via Mobile Device __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily"

Register or Log In To remove these advertisements.