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



Register or Log In To remove these advertisements.

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.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Register or Log In To remove these advertisements.