'86 K10 Mpg - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brad_Olson · 05-27-2005, 11:40 AM

I'm curious to know what others with trucks similar to mine are seeing for MPG; mine's driven mostly on the highway but I haven't calculated the MPG lately. My setup:

'86 K10
Stock suspension & tires
2.73 gears
4-speed MT
305 Q-Jet, no air pump
Single exhaust, no cat
Initial timing 10 BTDC for 89 octane

Thanks!

Brad

72 CustomCamper · 05-27-2005, 02:49 PM

My 86 K/10 long bed has a stock 305,stock suspension with 31" tires, 3:08 gears, 700R4 trans, dual 2 1/4 exhaust with stock manafolds, stock Q-jet, air pump,have no idea what timing is set at but uses 89 octane gas. I get about 6 MPG...

Chuck

Greenlee · 05-27-2005, 03:48 PM

76'
350 w/ 700r4 (not sure about gear ratio, but I think its too high for the 700r4)

I was getting 12 M.P.G. I am getting 14 M.P.G. after installing a rebuilt Q-Jet and replacing the plugs and wires. I calculate the gas milage quite often when I fill it up, and it doesn't seem to matter how fast or slow i drive as it still averages out to around 14 miles per gallon.

k72516 · 05-27-2005, 04:56 PM

Quote:

Originally Posted by 72 CustomCamper

I get about 6 MPG...

Wow, that sucks... Do you have a longbed?

bodydropped · 05-27-2005, 05:15 PM

i got a c-1500 350 700r holley 650 stock rear end not sure the ratio i get about 19mpg

82c10 · 05-27-2005, 06:30 PM

with my old 305 i got 8 mpg like i drive everyday, but one week i left my foot of the gas, and got 6, i am not lying i don't see how that happened it had a quadrajet new wires, cap, rotor, and plugs was timed at factory settings with a stock rearend i think it has 3.08 gears, and also a 350 tranny, i just put in a different motor so not for sure about the mileage on it though

86swb · 05-27-2005, 10:17 PM

Quote:

Originally Posted by bodydropped

i got a c-1500 350 700r holley 650 stock rear end not sure the ratio i get about 19mpg

19mpg-Wow! What year? I guess I need to get me a Holley 700r.

Maby lower my body to not catch as much wind.

*1FaastC10* · 05-27-2005, 10:35 PM

my 77 K20 gets 12 mpg. tired old 350/TH350/NP203 fulltime 4x4. 4.10 gears, and 30" tires. it probably does better than that, but the only time i checked it was with the 7.5' Western blade hanging on the front.

with a little tuning and an adjusted driving style, i'd almost bet you guys with low numbers can easily double your milage.

86swb · 05-27-2005, 10:38 PM

Thats not bad with 4x4 and low gears and the blade.

*1FaastC10* · 05-27-2005, 10:39 PM

Quote:

Originally Posted by 86swb

I guess I need to get me a Holley 700r.

for milage purposes, a 700R4 is a decent idea, although not totally necesary. as for the "Holley 700r", you might try separating the features of the truck in question in your head... 700R4 trans, Holley 650.

BTW, for milage, you CANNOT beat a QJet.

86swb · 05-27-2005, 10:42 PM

OK, my mistake. Sorry. What year is your truck? But I do want to put a 700R4 in mine also.

72 CustomCamper · 05-27-2005, 11:04 PM

Quote:

Originally Posted by k72516

Wow, that sucks... Do you have a longbed?

Yeah it's a long bed with a cap on it. The biggest problem is the choke isn't opening all the way and it's running rich. I need to rebuild the carb,but it fires up with just a touch of the key...

Chuck

72 CustomCamper · 05-27-2005, 11:07 PM

Here's a shot of the old girl with her top on...

Chuck

FLAGG · 05-28-2005, 12:37 AM

My "old" '85 Silverado with a 305, 700R4, and 3.42 gears was getting anywhere between 11 and 14MPG back when I was actively calculating gas mileage.

I recently upgraded to an '86 Sierra with a 350, TH400, and 3.73 gears. I haven't worked out the mileage yet. However, on the old '85 Silverado I was doing about 200 to 250 km per tank (down to 1/4 tank left), and now with the '86 I'm doing somewhere between 150 and 200km per tank (again to about 1/4 tank left).

ElGracho · 05-28-2005, 01:07 AM

Quote:

Originally Posted by 1FaastC10

BTW, for milage, you CANNOT beat a QJet.

I beg to differ:

k72516 · 05-28-2005, 01:49 PM

Hey Chuck, I can't get over that 6MPG... It makes me reconsider buying a 73-87 when I can get this for a comparable price... These models get 5MPG, but the older deuces get 12-14.

lol Makes ya wonder...

jermasaurus · 05-28-2005, 02:19 PM

Quote:

Originally Posted by 72 CustomCamper

The biggest problem is the choke isn't opening all the way and it's running rich. I need to rebuild the carb,but it fires up with just a touch of the key...

Chuck

I'm sure that choke not opening all the way is really killing the mileage. I rebuilt my Q-jet and put a manual choke on it, but the choke cable was binding up in the housing. I drove about 90 miles half choked and waisted 15 gallons. When it is working properly, I can get about 180-190 miles out of 15 gallons.
-Jeremy

72 CustomCamper · 05-28-2005, 03:30 PM

Quote:

Originally Posted by k72516

Hey Chuck, I can't get over that 6MPG... It makes me reconsider buying a 73-87 when I can get this for a comparable price... These models get 5MPG, but the older deuces get 12-14.

lol Makes ya wonder...

I'd love to have an old deuce and a half, but I don't have anywhere to park it. Except maybe on top of the neighbor's tuner... LOL

Chuck

apstguy · 05-28-2005, 04:59 PM

2wd TH700r 3.08 305 I get 8.5 mpg

86swb · 05-28-2005, 06:14 PM

What is the deal with our trucks and bad mpg? Years ago on a '72 Chevy 1/2 ton with a 350/350 Auto I was getting really bad mpg so I got me a Edelbroke intake and what they use to call the "fuel saver carbertor" and I got around 17mpg. A great improvement. But now they say they can not get that four barrel any more. It has been about 17 or more years ago when I got the "fuel saver" Go figure.

screwballl · 05-28-2005, 07:29 PM

with my 76 (LWB, 350, stock gearing) i went from 7mpg with crapped out Qjet to around 17mpg with Edelbrock 600cfm running slightly lean

*1FaastC10* · 05-28-2005, 08:26 PM

wow... i got better milage than some of you guys with stock engines driving an 82 C10 with a VERY lumpy cam, and a 3000 stall converter. i was getting almost 10 out of that. you guys REALLY need to figure out that tuning for power isnt everything. you've got trucks, not racecars.

SanitysBane · 05-28-2005, 09:51 PM

454/700R4 12ish in town, and around 17-18 on the highway. Oh, and my 454 makes 500 hp.

mitch1965 · 05-29-2005, 09:17 AM

'85 K20 tired350/th350, 4.10 gears
I am averaging 10.5 - 11mpg. I just rebuilt the stock Rochester Q-jet, but I am contemplating swapping this for the Edelbrock 1406.

*1FaastC10* · 05-29-2005, 04:17 PM

Quote:

Originally Posted by mitch1965

'85 K20 tired350/th350, 4.10 gears
I am averaging 10.5 - 11mpg. I just rebuilt the stock Rochester Q-jet, but I am contemplating swapping this for the Edelbrock 1406.

DONT! the larger primaries of the 1406 will kill you low end power, as well as mpg. i went trhough the same thing with my Trans Am, and noticed a significant loss in fuel economy, as well as upper end power because the secondaries on the 1406 are so much smaller. yes, your grandma could tune the 1406, but with a little work the QJet will make you much happier.

05-27-2005, 11:40 AM	#1
Brad_Olson Active Member Join Date: Mar 2005 Location: Stoughton, WI Posts: 187	'86 K10 Mpg I'm curious to know what others with trucks similar to mine are seeing for MPG; mine's driven mostly on the highway but I haven't calculated the MPG lately. My setup: '86 K10 Stock suspension & tires 2.73 gears 4-speed MT 305 Q-Jet, no air pump Single exhaust, no cat Initial timing 10 BTDC for 89 octane Thanks! Brad

05-27-2005, 02:49 PM	#2
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	My 86 K/10 long bed has a stock 305,stock suspension with 31" tires, 3:08 gears, 700R4 trans, dual 2 1/4 exhaust with stock manafolds, stock Q-jet, air pump,have no idea what timing is set at but uses 89 octane gas. I get about 6 MPG... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

05-27-2005, 05:15 PM	#5
bodydropped Registered User Join Date: Jan 2005 Location: beaumont,tx Posts: 757	i got a c-1500 350 700r holley 650 stock rear end not sure the ratio i get about 19mpg __________________ http://img.photobucket.com/albums/v5...ropped/sig.jpg

05-27-2005, 10:35 PM	#8
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	my 77 K20 gets 12 mpg. tired old 350/TH350/NP203 fulltime 4x4. 4.10 gears, and 30" tires. it probably does better than that, but the only time i checked it was with the 7.5' Western blade hanging on the front. with a little tuning and an adjusted driving style, i'd almost bet you guys with low numbers can easily double your milage. Last edited by 1FaastC10; 05-27-2005 at 10:36 PM.

05-27-2005, 10:38 PM	#9
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	Thats not bad with 4x4 and low gears and the blade. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

05-27-2005, 03:48 PM	#3
Greenlee Registered User Join Date: Jun 2004 Location: El Lago, TX Posts: 1,668	76' 350 w/ 700r4 (not sure about gear ratio, but I think its too high for the 700r4) I was getting 12 M.P.G. I am getting 14 M.P.G. after installing a rebuilt Q-Jet and replacing the plugs and wires. I calculate the gas milage quite often when I fill it up, and it doesn't seem to matter how fast or slow i drive as it still averages out to around 14 miles per gallon.

05-27-2005, 06:30 PM	#6
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	with my old 305 i got 8 mpg like i drive everyday, but one week i left my foot of the gas, and got 6, i am not lying i don't see how that happened it had a quadrajet new wires, cap, rotor, and plugs was timed at factory settings with a stock rearend i think it has 3.08 gears, and also a 350 tranny, i just put in a different motor so not for sure about the mileage on it though

05-27-2005, 10:42 PM	#11
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	OK, my mistake. Sorry. What year is your truck? But I do want to put a 700R4 in mine also. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

05-27-2005, 11:07 PM	#13
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Here's a shot of the old girl with her top on... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

05-28-2005, 12:37 AM	#14
FLAGG Registered User Join Date: Feb 2004 Location: St. Albert, Alberta, Canada Posts: 89	My "old" '85 Silverado with a 305, 700R4, and 3.42 gears was getting anywhere between 11 and 14MPG back when I was actively calculating gas mileage. I recently upgraded to an '86 Sierra with a 350, TH400, and 3.73 gears. I haven't worked out the mileage yet. However, on the old '85 Silverado I was doing about 200 to 250 km per tank (down to 1/4 tank left), and now with the '86 I'm doing somewhere between 150 and 200km per tank (again to about 1/4 tank left).

05-28-2005, 01:49 PM	#16
k72516 Registered User Join Date: May 2005 Location: Easthampton, MA Posts: 74	Hmmmm.... Hey Chuck, I can't get over that 6MPG... It makes me reconsider buying a 73-87 when I can get this for a comparable price... These models get 5MPG, but the older deuces get 12-14. lol Makes ya wonder... __________________ Go Fast - Be Loud

05-28-2005, 04:59 PM	#19
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	2wd TH700r 3.08 305 I get 8.5 mpg __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

05-28-2005, 06:14 PM	#20
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	What is the deal with our trucks and bad mpg? Years ago on a '72 Chevy 1/2 ton with a 350/350 Auto I was getting really bad mpg so I got me a Edelbroke intake and what they use to call the "fuel saver carbertor" and I got around 17mpg. A great improvement. But now they say they can not get that four barrel any more. It has been about 17 or more years ago when I got the "fuel saver" Go figure. __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

05-28-2005, 07:29 PM	#21
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,755	with my 76 (LWB, 350, stock gearing) i went from 7mpg with crapped out Qjet to around 17mpg with Edelbrock 600cfm running slightly lean __________________ 91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. -------------------

05-28-2005, 08:26 PM	#22
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	wow... i got better milage than some of you guys with stock engines driving an 82 C10 with a VERY lumpy cam, and a 3000 stall converter. i was getting almost 10 out of that. you guys REALLY need to figure out that tuning for power isnt everything. you've got trucks, not racecars.



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05-28-2005, 09:51 PM	#23
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	454/700R4 12ish in town, and around 17-18 on the highway. Oh, and my 454 makes 500 hp. __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

05-29-2005, 09:17 AM	#24
mitch1965 Registered User Join Date: Oct 2004 Location: Fort Collins, Colorado Posts: 376	'85 K20 tired350/th350, 4.10 gears I am averaging 10.5 - 11mpg. I just rebuilt the stock Rochester Q-jet, but I am contemplating swapping this for the Edelbrock 1406. __________________ '99 K1500 Tahoe, 2dr, barn doors - 350/ 4L60E, 3.73 '01 K2500HD Silverado Ext Cab - 496/ Allison, 4.10

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