MPG poll - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Longhorn Man · 09-10-2005, 09:25 PM

This has been discussed before, and I'm sure maybe even a poll... but I have no recollection of it so...
(you can vote more than once...since some of you have more than one truck)

Longhorn Man · 09-10-2005, 09:37 PM

Also.... feel free to describe your rig's mechanicals... stock, mild, wild... inline, small block, big block, cross breed... stick shift, slush box, one to one, over drive... 4X4 4X2...blah blah blah...

Mine is a cross breed caddy 500 wearing an Edelbrock 750 on top with a one to one (TH350) slush box automatic with a 4.10 in the rear... I get 10 MPG.

Longhorn Man · 09-10-2005, 09:38 PM

Oh yeah...if you have a Fuel injection swap and you ARE actually getting 20+ on a regular basis.....please share that too!

**Canadian694x4** · 09-10-2005, 09:47 PM

Voted 10 to 12. 69 4x4, 283 4bbl (Fresh Rebuild), TH350 (Coupled To A NP208), 3.73 Ratio?? Hmm...I should really get off my ass and check that...

al's71gmc · 09-10-2005, 10:06 PM

I went with the 10-12. Last time I checked it was 11.5 mpg. But I haven't checked since going to the taller tires. Most of my miles are at highway speed so maybe I'm getting a little better? I also try to keep the speed to around 65 instead of 75-80. Of course my speedo is off some from going taller too....
Al

Hey Longhorn Man- I grew up outside of Cincinnati. Moved out west for good about 6 years ago.

Longhorn Man · 09-10-2005, 10:15 PM

yeah, I'm planning a move out west too...where insanity meets the sea. (LA)

llegos · 09-10-2005, 10:19 PM

voted 14. '69 GMC short step 4X2, 3.73 and 33's. all those RPM calcs are bull cuz it says i should be at 2700RPM at 60, where im at like 3K. but anyhow, i run a NP435GA. im gonna step down to somewhere 3.08 to 3.42 and a 29 or 28" tire

cableguy0 · 09-10-2005, 10:22 PM

i cant really vote if i keep my foot out of it i get right around 10 but as soon as i crack it open it starts drinking and quickly goes somewhere under 4 mpg at that point.

69 longhorn · 09-10-2005, 10:48 PM

The old longhorn is running an Edelbrock rpm topped 383,with a comp XE268 cam,400 turbo with a 2500 stall converter. all that runs through a set of 3.40 gears, on a 29" tall tire. 3000 rpm cruise on the hyway gets me right at 73 mph,& will go right at 10mpg ......if driven easy(thats a big IF at times tho

).

L

**Ironhorse** · 09-10-2005, 10:51 PM

I voted in the 10-12 mpg range. When I have the nerve to check it, usually comes in just a hair over 11-11.5 range. Stock 350, (not orginal to the truck) 2bbl, 4 speed, 4x4 with NP 205, 31-10.50's on rallies, 4:11 gears. Generally does best if I stay between 55-60 on the high way. Have to drive it like Grandpa, light foot, no speed shifting. (But then, how do you speed shift a granny 4 speed,

)

**pjmoreland** · 09-10-2005, 10:58 PM

16 MPG, 300HP 350, 700R4, 3.73 gears, 29in. tires, HEI, Edelbrock 1400 carb, Performer RPM intake, stock ramhorn manifolds.

farside847 · 09-10-2005, 11:04 PM

I get a little over 13. 307 with the stock 2bbl. 29" tires and 3.73 gears. Im looking to switch to 3.08 soon and hope to be over 15.

see ten · 09-10-2005, 11:06 PM

I have gotten 14.75 out of my C10. That's in the left lane of the interstate with the A/C wide open. I have a 350 with an Edelbrock intake, underdrive pulleys, MSD coil and wires, roller tip rockers, K&N filter and filtered lid with a quadrajet. It has a turbo 350 trans and a 3.08 gear. I have also removed the engine driven fan and replaced it with an electric Flex-a-lite unit.
I have gotten a high 12 out of my K10. It is almost an identical setup with the addition of a 4x4 cam. It runs a 33x12.50 M/T claw and a 3.08 gear. It would probably pick up a mile or two per gallon with a less aggressive tire.

shifty · 09-10-2005, 11:54 PM

I hope to be above 18-20 after I finish my swap.

supercheyenne · 09-11-2005, 12:39 AM

Voted 13-14. It's very unofficial. 99% highway miles and my odometer might be off.

*HerLonghorn71* · 09-11-2005, 01:06 AM

I wont vote this time cause my truck aint used a drop in a year

but it used to get 10-12

72 CustomCamper · 09-11-2005, 01:46 AM

Play toy
72 C/20 built 400hp 396 700r4 trans 4:11 dana 60 rear don't remember what size tires but bigger than stock gets around 4 MPG.
Daily driver
86 K/10 stock 305 700r4 trans 3:08 10 bolt rears 31x10.50x15 tires gets around 8 MPG...

Chuck

jsbgump · 09-11-2005, 02:30 AM

68 SWB 350 RV cam/flat tops Torker intake 600 edelbrock stock turbo 350 has a 3.73 posi rear. get around 10-12 unless i feel like trying to put my foot through the firewall then it might get 5

xcracer · 09-11-2005, 03:13 AM

454, t350, np205, 1970 k/20, pulling a heavy trailer make no difference ! lol

gregbr · 09-11-2005, 03:28 AM

I did a post like this about 4 months ago, got lots of got info, can't find it now. Anybody know how to search with google?

70 GMC C-10 SWB, 402/T400, 308 gears, (all factory stock) has 275-60-15's....about 10 mpg.

67 Chevy K10 SWB, built 350/T350, 373 gears, 33-10.50-15's....10 mpg.

94 Honda Civic, 1.5L auto.....32 mpg, sorry, I had to throw it in.

Both have the speedo's off a couple miles per hour at 55. Greg

tylermckee · 09-11-2005, 03:40 AM

72 c10 lwb th 350 dont know my ratio probably gets 10-12 all the time

99 silverado gets a hair over 20 on the highway, i think something like 15 in town

LUV2XCLR8 · 09-11-2005, 06:08 AM

ENGINE

1970 LT1 BLOCK
1970 LT1 FORGED CRANK
1970 LT1 FORGED RODS
TRW FORGED PISTONS .030
MILODON OIL PAN
1970 LT1 CAMEL BACK HEADS, 2.02/1.60 3 ANGLE VALVE JOB,
HEADS HAVE BEEN EXTENSIVELY PORTED & POLISHED
LUNATI CAM 290?
LUNATI TIMING GEARS
HOLLEY DOMINATOR INTAKE
3310 HOLLEY CARB 750 CFM
MALLORY UNILIGHT DISTRIBUTOR
ALUMINUM WATER PUMP
HEADMAN ELITE CERAMIC COATED HEADERS
APPROXIMATELY 425 H.P.

THE REST

350 TURBO AUTOMATIC
NP205 TRANSFER CASE
3.08 GEARS FRT. & REAR
35 X 12.5 X 15 BFG'S

SHOULD GET 10-12 LIKE ASA SAID ABOVE (SEETEN)
BUT REALISTICALLY IT GETS LIKE 6-8, THIS MOTOR
MUST BE MORE OF A HOSS THAN THE PO STATES

(IT SHOULD GET GOOD GAS MILAGE BECAUSE OF THOSE
3.08 GEARS RIGHT? WRONG, THAT'S AN OLD WISE TALE)

TP from Cntl PA · 09-11-2005, 09:13 AM

38 MPG with Mine..................And no, I am not a liar and I am not stoned!

One of the best choices I ever made was tossing that small block!

**68 Stepside** · 09-11-2005, 09:24 AM

I think I got 120 miles per tank one time, and was happy with that

What is that, 6-ish mpg? That was with a smogger 350, 3.73's and 29" tires. I'm sure the 406 is gonna be even worse.

lloyd k · 09-11-2005, 10:24 AM

just went on a trip to athens and back ,a load of wood ,two 270 pound guys and running 70-15 mpg not to bad .tires are 235/75/15s

View Poll Results: What's your MPG?
Less than 7 MPG...I should own stock in the oil fields.	33	6.48%
7 to 9 MPG ... can I get some gas money please?	86	16.90%
10 to 12 MPG ... And I thought I had it bad...look at those suckers getting less!	198	38.90%
13 to 14 MPG ... Yeah... I'm doing OK	103	20.24%
15 to 17 MPG ... Heh...I'm doin better than the new trucks!	60	11.79%
18 to 20 MPG ... Why does everyone say B.S. when i tell them this????	20	3.93%
20+ I am a compulsive lier and I am stoned. (j/k if anyone here actually DOES do this good.... or if you are a lier and a stoner and feel insulted)	20	3.93%
MPG... Whats that? I get KPL and it is so wierd that you americans never seem to be able to figure it out.	12	2.36%
Multiple Choice Poll. Voters: 509. You may not vote on this poll

09-10-2005, 09:25 PM	#1
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	MPG poll This has been discussed before, and I'm sure maybe even a poll... but I have no recollection of it so... (you can vote more than once...since some of you have more than one truck)

09-10-2005, 09:37 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Also.... feel free to describe your rig's mechanicals... stock, mild, wild... inline, small block, big block, cross breed... stick shift, slush box, one to one, over drive... 4X4 4X2...blah blah blah... Mine is a cross breed caddy 500 wearing an Edelbrock 750 on top with a one to one (TH350) slush box automatic with a 4.10 in the rear... I get 10 MPG. Last edited by Longhorn Man; 09-10-2005 at 09:39 PM.

09-10-2005, 09:47 PM	#4
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,306	Voted 10 to 12. 69 4x4, 283 4bbl (Fresh Rebuild), TH350 (Coupled To A NP208), 3.73 Ratio?? Hmm...I should really get off my ass and check that... __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 20 Yrs - 1 of 208 Built & Sold In Canada! - 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 2 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 15 Yrs - 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 13 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 6 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

09-10-2005, 10:06 PM	#5
al's71gmc 4 eyed fever Join Date: Jul 2005 Location: Eureka, Nevada Posts: 500	I went with the 10-12. Last time I checked it was 11.5 mpg. But I haven't checked since going to the taller tires. Most of my miles are at highway speed so maybe I'm getting a little better? I also try to keep the speed to around 65 instead of 75-80. Of course my speedo is off some from going taller too.... Al Hey Longhorn Man- I grew up outside of Cincinnati. Moved out west for good about 6 years ago. __________________ 1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!! Last edited by al's71gmc; 09-10-2005 at 10:08 PM.

09-10-2005, 09:38 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Oh yeah...if you have a Fuel injection swap and you ARE actually getting 20+ on a regular basis.....please share that too!

09-10-2005, 10:15 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	yeah, I'm planning a move out west too...where insanity meets the sea. (LA)

09-10-2005, 10:19 PM	#7
llegos Registered User Join Date: Aug 2005 Location: pleasanton, CA Posts: 570	voted 14. '69 GMC short step 4X2, 3.73 and 33's. all those RPM calcs are bull cuz it says i should be at 2700RPM at 60, where im at like 3K. but anyhow, i run a NP435GA. im gonna step down to somewhere 3.08 to 3.42 and a 29 or 28" tire __________________ -Steve

09-10-2005, 10:22 PM	#8
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	i cant really vote if i keep my foot out of it i get right around 10 but as soon as i crack it open it starts drinking and quickly goes somewhere under 4 mpg at that point. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

09-10-2005, 10:48 PM	#9
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	The old longhorn is running an Edelbrock rpm topped 383,with a comp XE268 cam,400 turbo with a 2500 stall converter. all that runs through a set of 3.40 gears, on a 29" tall tire. 3000 rpm cruise on the hyway gets me right at 73 mph,& will go right at 10mpg ......if driven easy(thats a big IF at times tho ). L __________________ http://community.webshots.com/user/hotrodhorn

09-10-2005, 10:51 PM	#10
Ironhorse Senior Member Join Date: Jul 2001 Location: Wellington, Ks Posts: 10,021	I voted in the 10-12 mpg range. When I have the nerve to check it, usually comes in just a hair over 11-11.5 range. Stock 350, (not orginal to the truck) 2bbl, 4 speed, 4x4 with NP 205, 31-10.50's on rallies, 4:11 gears. Generally does best if I stay between 55-60 on the high way. Have to drive it like Grandpa, light foot, no speed shifting. (But then, how do you speed shift a granny 4 speed, ) __________________ 1971 Chevy 1/2T 4x4 LWB 350 V-8 Was sm465-now 350TH/np205 Tilt, Tach, Towhooks Original Truck AM/FM Wellington, Ks

09-10-2005, 10:58 PM	#11
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,315	16 MPG, 300HP 350, 700R4, 3.73 gears, 29in. tires, HEI, Edelbrock 1400 carb, Performer RPM intake, stock ramhorn manifolds.

09-10-2005, 11:04 PM	#12
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 991	I get a little over 13. 307 with the stock 2bbl. 29" tires and 3.73 gears. Im looking to switch to 3.08 soon and hope to be over 15. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

09-10-2005, 11:06 PM	#13
see ten WTB this ad Join Date: Sep 2004 Location: Lafayette Georgia Posts: 5,073	I have gotten 14.75 out of my C10. That's in the left lane of the interstate with the A/C wide open. I have a 350 with an Edelbrock intake, underdrive pulleys, MSD coil and wires, roller tip rockers, K&N filter and filtered lid with a quadrajet. It has a turbo 350 trans and a 3.08 gear. I have also removed the engine driven fan and replaced it with an electric Flex-a-lite unit. I have gotten a high 12 out of my K10. It is almost an identical setup with the addition of a 4x4 cam. It runs a 33x12.50 M/T claw and a 3.08 gear. It would probably pick up a mile or two per gallon with a less aggressive tire.

09-10-2005, 11:54 PM	#14
shifty Questionable Join Date: Mar 2005 Location: Atlanta Posts: 13,376	I hope to be above 18-20 after I finish my swap. __________________ If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.



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09-11-2005, 12:39 AM	#15
supercheyenne Registered User Join Date: Dec 1999 Location: Newton, KS, U.S.A. Posts: 1,142	Voted 13-14. It's very unofficial. 99% highway miles and my odometer might be off.

09-11-2005, 01:06 AM	#16
HerLonghorn71 Account Suspended Join Date: Dec 2004 Location: Canada Posts: 730	I wont vote this time cause my truck aint used a drop in a year but it used to get 10-12

09-11-2005, 01:46 AM	#17
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Play toy 72 C/20 built 400hp 396 700r4 trans 4:11 dana 60 rear don't remember what size tires but bigger than stock gets around 4 MPG. Daily driver 86 K/10 stock 305 700r4 trans 3:08 10 bolt rears 31x10.50x15 tires gets around 8 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!"

09-11-2005, 02:30 AM	#18
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	68 SWB 350 RV cam/flat tops Torker intake 600 edelbrock stock turbo 350 has a 3.73 posi rear. get around 10-12 unless i feel like trying to put my foot through the firewall then it might get 5 __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

09-11-2005, 03:13 AM	#19
xcracer Registered User Join Date: Apr 2005 Location: Albert Lea, MN Posts: 15	454, t350, np205, 1970 k/20, pulling a heavy trailer make no difference ! lol

09-11-2005, 03:28 AM	#20
gregbr Senoir Member Join Date: Mar 2002 Location: Rock Hill, SC USA Posts: 1,214	I did a post like this about 4 months ago, got lots of got info, can't find it now. Anybody know how to search with google? 70 GMC C-10 SWB, 402/T400, 308 gears, (all factory stock) has 275-60-15's....about 10 mpg. 67 Chevy K10 SWB, built 350/T350, 373 gears, 33-10.50-15's....10 mpg. 94 Honda Civic, 1.5L auto.....32 mpg, sorry, I had to throw it in. Both have the speedo's off a couple miles per hour at 55. Greg __________________ 67 Chevy, Small back glass, Factory 4WD, Factory Shortbed, Factory V8, Lifted 4" 70 GMC Sierra Grande, Factory Shortbed, Factory 402/400 turbo, Super Custom Interior. Numbers matching with SPID & Build Sheet. 68K Original Miles. Restored 2010 70 GMC Restoration Pictures http://67-72chevytrucks.com/gallery/...00&ppuser=4424 Last edited by gregbr; 09-11-2005 at 03:32 AM.

09-11-2005, 03:40 AM	#21
tylermckee Registered User Join Date: Apr 2005 Location: anacortes Posts: 75	72 c10 lwb th 350 dont know my ratio probably gets 10-12 all the time 99 silverado gets a hair over 20 on the highway, i think something like 15 in town

09-11-2005, 06:08 AM	#22
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,470	ENGINE 1970 LT1 BLOCK 1970 LT1 FORGED CRANK 1970 LT1 FORGED RODS TRW FORGED PISTONS .030 MILODON OIL PAN 1970 LT1 CAMEL BACK HEADS, 2.02/1.60 3 ANGLE VALVE JOB, HEADS HAVE BEEN EXTENSIVELY PORTED & POLISHED LUNATI CAM 290? LUNATI TIMING GEARS HOLLEY DOMINATOR INTAKE 3310 HOLLEY CARB 750 CFM MALLORY UNILIGHT DISTRIBUTOR ALUMINUM WATER PUMP HEADMAN ELITE CERAMIC COATED HEADERS APPROXIMATELY 425 H.P. THE REST 350 TURBO AUTOMATIC NP205 TRANSFER CASE 3.08 GEARS FRT. & REAR 35 X 12.5 X 15 BFG'S SHOULD GET 10-12 LIKE ASA SAID ABOVE (SEETEN) BUT REALISTICALLY IT GETS LIKE 6-8, THIS MOTOR MUST BE MORE OF A HOSS THAN THE PO STATES (IT SHOULD GET GOOD GAS MILAGE BECAUSE OF THOSE 3.08 GEARS RIGHT? WRONG, THAT'S AN OLD WISE TALE) __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Big Piggy: "Goliath" 07 Kodiak C4500 Lil Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T Last edited by LUV2XCLR8; 09-11-2005 at 06:41 AM.

09-11-2005, 09:13 AM	#23
TP from Cntl PA Registered User Join Date: Apr 2003 Location: Central PA....In the Berg of Nisbet Posts: 790	38 MPG with Mine..................And no, I am not a liar and I am not stoned! One of the best choices I ever made was tossing that small block! __________________ '72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!!

09-11-2005, 09:24 AM	#24
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	I think I got 120 miles per tank one time, and was happy with that What is that, 6-ish mpg? That was with a smogger 350, 3.73's and 29" tires. I'm sure the 406 is gonna be even worse. __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

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09-11-2005, 10:24 AM	#25
lloyd k Registered User Join Date: Feb 2004 Location: columbus,ohio Posts: 201	just went on a trip to athens and back ,a load of wood ,two 270 pound guys and running 70-15 mpg not to bad .tires are 235/75/15s __________________ 67 swb gmc,big block cadillac powered,400 turbo,2.73 ratio and disc brakes-basically a frankenstein of many parts-