Gas mileage - whachoo get? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MrC1 · 10-10-2005, 10:37 PM

Just wondering how everyone does on gas. I'm new to these trucks and my project truck still needs a carb rebuild, so I can't complain too much I guess.

Here's my setup: '72 C20, 402, Q-jet 4bbl, 700R4 tranny, Dana 60 with 3.54s

Average MPG so far (70/30 city/hwy mix): 10.8 MPG

Now here's the rule - no embellishing your figures. No rounding up, etc., so I don't want to see anybody running a 500 hp 454 with 4.10s averaging 24 MPG! Sorry, not gonna happen!

pebbleboy · 10-10-2005, 11:11 PM

With a 400 small block 700r4 trans and 2 brl holly carb................ I really dont wanna know.

I thought about it when gas was at $3.00 but its my daily driver and don't wanna know how

I am.

llegos · 10-10-2005, 11:21 PM

10 before i put on my rebuilt carb and a tune, i HOPE for 13 after this. 350 and NP435 4x2 3.73(will be 3.42 hopefully soon)

tattoo · 10-10-2005, 11:23 PM

I'm driving my 350/350 4bbl all around north america this spring for the next couple years. I would love to know who's getting what for mileage?

Frizzle Fry · 10-10-2005, 11:27 PM

8 mpg in a factory 396/400 Burb... Daily Driver. Going to 700R4 soon!

Longhorn Man · 10-10-2005, 11:30 PM

I did a poll recently on here... http://67-72chevytrucks.com/vboard/s....php3?t=172346
10 -12 is the most common, with 13 - 14 being second most comon.
My 500 caddy with 4.10 gears and 31 inch tall rear tires and a non lock up TH350 gets about 10 MPG in town and on the open road. Which is about the same as my old SWB GMC with a 350.

walker · 10-10-2005, 11:33 PM

Last I checked, with my 350/400, 4.11 gears, I was getting about 12mpg. I could probably get more but it is about 40 mile round trip to get into town on the highway going 75 MPH. If I were just tooling around in town I would expect 13 or 14 MPG, just when those RPM get up to 4000ish the fuel economy dies.

chevy_fatman · 10-10-2005, 11:34 PM

Quote:

Originally Posted by Longhorn Man

I did a poll recently on here... http://67-72chevytrucks.com/vboard/s....php3?t=172346
10 -12 is the most common, with 13 - 14 being second most comon.
My 500 caddy with 4.10 gears and 31 inch tall rear tires and a non lock up TH350 gets about 10 MPG in town and on the open road. Which is about the same as my old SWB GMC with a 350.

What the he!!?? I was gonna reply with the same thing, Do you live here or what?? give a guy a chace to reply some

J/K

86swb · 10-10-2005, 11:41 PM

I have not checked my '70 lately but on the '86 swb w/350 and 350 tranny the last time I checked between 10 and 12mph. Do not know what the rear is guessing 3:73. Does changing over to a 700R4 help much. Also changing to say a 3:08 gears? I am thinking about doing something to help boost up the mileage on the "86.

Orence1 · 10-10-2005, 11:49 PM

Built 402 (450HP) with TH-350 and 3:07 gears. 15" tires on a LWB 72 Cheyenne. Getting 7-8 at best on premium fuel but having a great time doing it. Limiting myself to one tank of fuel a month so only weekend excursions.

Robert1970C20rstbukt · 10-10-2005, 11:58 PM

stock 350(Qjet, points, stock air cleaner), TH400, 4.10 No-Spin rear, 33" mud tires. i'm getting about 6-8 in town, maybe 10-12 on the highway.

72 CustomCamper · 10-11-2005, 12:24 AM

72 C/20 with 66 396 10.5-1 flattops 400 hp, Dana 60 w/ 4:11, 700R4 trans gets about 4 MPG...

Chuck

bobs409 · 10-11-2005, 06:48 AM

69 short stepside with a 75 Impala 350/th350, 3:73 rear gears and it weighs 3700 without me. I get 16 town & 16 highway. (yep, same both ways)

I can live with my mileage, it's not bad. I drive mine daily. My 72 Chevelle w/307 gets the same thing.

Tink · 10-11-2005, 07:11 AM

76 K5 - Stock 350 w/ Quadra jet, THM350, 3.08s turning 33's - 7MPG average... mostly town driving, she isn't a highway truck.

GMan69 · 10-11-2005, 07:24 AM

Last time I checked mine, it was 15.3 on a cruise on the Natchez Trace Parkway from Nashville, TN to Jackson, MS. HOWEVER, since then, Putter and I swapped rear axles: I got his 3.73 and he got my 3.07. Since my speedo isn't accurate anymore, I haven't checked it since, but suffice to say, it ain't gettin' 15.3 anymore!

Matt67C10 · 10-11-2005, 07:47 AM

13.6mpg- 250 cid 6, 3 speed.

screwballl · 10-11-2005, 07:51 AM

last i checked about 8mpg in my 91 R2500 burb with 454

hotrodhomi · 10-11-2005, 09:56 AM

I average about $190/ week

farside847 · 10-11-2005, 10:49 AM

13.5mpg on a 307 3 speed with 3.73 in back

97silv5.7 · 10-11-2005, 12:05 PM

14-15 in the winter 17-18 in the summer, sometimes 20 if I ride the highway a lot and thats my 97 k1500 5.7 litre

68haywagon · 10-11-2005, 01:05 PM

About 11-12 on my 250 L6-3 speed w/ 3.73s and 225/75/15s....I want a v8 so I can get 12mpg and horsepower together

Mike

*iceman7329* · 10-11-2005, 01:13 PM

My TBI 350 and 700R4 get about 21 mpg

64fleetside · 10-11-2005, 02:07 PM

I get 16+ consistent w/230/3sp/3.73, but I drive like an old man, got 18.5(!) last tank going really slow(gas was over $3 a gallon),, my 64 w/350/700/3.42 does about the same. Brian

lukecp · 10-11-2005, 03:28 PM

My '97 Saturn gets 30 city / 38 highway

But the best I ever got out of my '72 C10 was 13.5. Needless to say I don't drive it anymore.

mr402 · 10-11-2005, 03:50 PM

71 GMC 3/4. 402 4spd, 3.54 gear 16" rims. Only mods are HEI, Edelbrock intake and carb. 11.5 no matter how I drive it. Loaded, unloaded, highway or city.

10-10-2005, 10:37 PM	#1
MrC1 Dork For Days Join Date: Aug 2005 Location: Dallas Posts: 407	Gas mileage - whachoo get? Just wondering how everyone does on gas. I'm new to these trucks and my project truck still needs a carb rebuild, so I can't complain too much I guess. Here's my setup: '72 C20, 402, Q-jet 4bbl, 700R4 tranny, Dana 60 with 3.54s Average MPG so far (70/30 city/hwy mix): 10.8 MPG Now here's the rule - no embellishing your figures. No rounding up, etc., so I don't want to see anybody running a 500 hp 454 with 4.10s averaging 24 MPG! Sorry, not gonna happen!

10-10-2005, 11:21 PM	#3
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	10 before i put on my rebuilt carb and a tune, i HOPE for 13 after this. 350 and NP435 4x2 3.73(will be 3.42 hopefully soon) __________________ -Steve

10-10-2005, 11:27 PM	#5
Frizzle Fry Registered User Join Date: Aug 2005 Location: Hillsboro Oregon Posts: 6,449	8 mpg in a factory 396/400 Burb... Daily Driver. Going to 700R4 soon! Last edited by Frizzle Fry; 10-10-2005 at 11:27 PM.

10-10-2005, 11:33 PM	#7
walker Registered User Join Date: Jul 2003 Location: north of Phx AZ about 30 miles Posts: 698	Last I checked, with my 350/400, 4.11 gears, I was getting about 12mpg. I could probably get more but it is about 40 mile round trip to get into town on the highway going 75 MPH. If I were just tooling around in town I would expect 13 or 14 MPG, just when those RPM get up to 4000ish the fuel economy dies. __________________ Andy,Phx AZ '67 C-10 (Ahhh, done at last. Well there is that disk front end I want to put in and...) "23 C-Cab-sold '48 Ford 8N tractor(still working) '67 Scout(Now on the road) '70 MG B.-sold

10-10-2005, 11:41 PM	#9
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	I have not checked my '70 lately but on the '86 swb w/350 and 350 tranny the last time I checked between 10 and 12mph. Do not know what the rear is guessing 3:73. Does changing over to a 700R4 help much. Also changing to say a 3:08 gears? I am thinking about doing something to help boost up the mileage on the "86. __________________ 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

10-10-2005, 11:11 PM	#2
pebbleboy Son Of Gravel Man Join Date: Mar 2005 Location: Cleveland OH Posts: 638	With a 400 small block 700r4 trans and 2 brl holly carb................ I really dont wanna know. I thought about it when gas was at $3.00 but its my daily driver and don't wanna know how I am.

10-10-2005, 11:23 PM	#4
tattoo "Bondo, just say no!" Join Date: Sep 2005 Location: Barrie Ontario Canada Posts: 75	I'm driving my 350/350 4bbl all around north america this spring for the next couple years. I would love to know who's getting what for mileage?

10-10-2005, 11:30 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	I did a poll recently on here... http://67-72chevytrucks.com/vboard/s....php3?t=172346 10 -12 is the most common, with 13 - 14 being second most comon. My 500 caddy with 4.10 gears and 31 inch tall rear tires and a non lock up TH350 gets about 10 MPG in town and on the open road. Which is about the same as my old SWB GMC with a 350.

10-10-2005, 11:49 PM	#10
Orence1 Registered User Join Date: Jan 2000 Location: Bothell, WA Posts: 548	Built 402 (450HP) with TH-350 and 3:07 gears. 15" tires on a LWB 72 Cheyenne. Getting 7-8 at best on premium fuel but having a great time doing it. Limiting myself to one tank of fuel a month so only weekend excursions.

10-10-2005, 11:58 PM	#11
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	stock 350(Qjet, points, stock air cleaner), TH400, 4.10 No-Spin rear, 33" mud tires. i'm getting about 6-8 in town, maybe 10-12 on the highway. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck Last edited by Robert1970C20rstbukt; 10-10-2005 at 11:59 PM.

10-11-2005, 12:24 AM	#12
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	72 C/20 with 66 396 10.5-1 flattops 400 hp, Dana 60 w/ 4:11, 700R4 trans gets about 4 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!"

10-11-2005, 06:48 AM	#13
bobs409 1969 Custom 30 wrecker Join Date: Sep 2001 Location: Pottsville, Pa Posts: 2,611	69 short stepside with a 75 Impala 350/th350, 3:73 rear gears and it weighs 3700 without me. I get 16 town & 16 highway. (yep, same both ways) I can live with my mileage, it's not bad. I drive mine daily. My 72 Chevelle w/307 gets the same thing. __________________ Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10

10-11-2005, 07:11 AM	#14
Tink Registered User Join Date: May 2002 Location: VA Posts: 1,337	76 K5 - Stock 350 w/ Quadra jet, THM350, 3.08s turning 33's - 7MPG average... mostly town driving, she isn't a highway truck. __________________ 69 Chevy C10 88 Sierra 02 2500 Suburban And too many S10s to list!

10-11-2005, 07:24 AM	#15
GMan69 Registered User Join Date: Mar 2001 Location: Hernando, MS USA Posts: 1,152	Last time I checked mine, it was 15.3 on a cruise on the Natchez Trace Parkway from Nashville, TN to Jackson, MS. HOWEVER, since then, Putter and I swapped rear axles: I got his 3.73 and he got my 3.07. Since my speedo isn't accurate anymore, I haven't checked it since, but suffice to say, it ain't gettin' 15.3 anymore! __________________ George Morgan Hernando, MS '69 C-10 swb fleetside '72 GMC swb Stepside

10-11-2005, 07:47 AM	#16
Matt67C10 Registered User Join Date: Jun 2005 Location: Slatington, PA Posts: 536	13.6mpg- 250 cid 6, 3 speed. __________________ 67 C10 LWB Stepside- 250cid 6, 3speed



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10-11-2005, 07:51 AM	#17
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,754	last i checked about 8mpg in my 91 R2500 burb with 454 __________________ 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. -------------------

10-11-2005, 09:56 AM	#18
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	I average about $190/ week

10-11-2005, 10:49 AM	#19
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	13.5mpg on a 307 3 speed with 3.73 in back __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

10-11-2005, 12:05 PM	#20
97silv5.7 MooMoo Join Date: Feb 2004 Location: Shapleigh, Maine Posts: 2,424	14-15 in the winter 17-18 in the summer, sometimes 20 if I ride the highway a lot and thats my 97 k1500 5.7 litre __________________ '97 ext 4x4 3" body lift and 7'6" Fisher MM2 '04 Polaris 700 twin EFI sold 2-1-07 '07 Polaris 800 twin EFI Stealth Limited Edition Support the Board! Or deal with me foo! Its all fun and games till you find out shes 16.

10-11-2005, 01:05 PM	#21
68haywagon I'm watching you! Join Date: Feb 2005 Location: Levittown, PA Posts: 1,822	About 11-12 on my 250 L6-3 speed w/ 3.73s and 225/75/15s....I want a v8 so I can get 12mpg and horsepower together Mike __________________ 2012 Chevrolet Silverado 1500 Z71 4WD 1993 Chevrolet C-1500 W/T - Blue - 4.3L V-6, 4 speed auto - Dad's (RIP) 1992 Chevrolet S10 - LS swap project 1968 Chevrolet C-10 longbed fleetside - sold

10-11-2005, 01:13 PM	#22
iceman7329 Account Suspended Join Date: Mar 2005 Posts: 453	My TBI 350 and 700R4 get about 21 mpg

10-11-2005, 02:07 PM	#23
64fleetside Registered User Join Date: Apr 2004 Location: arkieland Posts: 1,070	I get 16+ consistent w/230/3sp/3.73, but I drive like an old man, got 18.5(!) last tank going really slow(gas was over $3 a gallon),, my 64 w/350/700/3.42 does about the same. Brian

10-11-2005, 03:28 PM	#24
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	My '97 Saturn gets 30 city / 38 highway But the best I ever got out of my '72 C10 was 13.5. Needless to say I don't drive it anymore. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

10-11-2005, 03:50 PM	#25
mr402 Registered User Join Date: Jan 2004 Location: Elmira, Oregon Posts: 449	71 GMC 3/4. 402 4spd, 3.54 gear 16" rims. Only mods are HEI, Edelbrock intake and carb. 11.5 no matter how I drive it. Loaded, unloaded, highway or city. __________________ Enjoying life again. Time to get those big blocks rolling.

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