yet another MPG thread - The 1947 - Present Chevrolet & GMC Truck Message Board Network

spinem · 07-06-2010, 12:24 AM

What mileage do you get in your:

straight 6?

350?

383?

454?

spinem · 07-06-2010, 12:27 AM

350 bored .30 over, rv cam, stock carb /w/ 1972 jets (5%more fuel)...fuel cooler(ice can) <b>11ish mpg</b>

spinem · 07-06-2010, 12:35 AM

mpg any one?????

clicketyclack · 07-06-2010, 12:37 AM

Quote:

Originally Posted by spinem

350 bored .30 over, rv cam, stock carb /w/ 1972 jets (5%more fuel)...fuel cooler(ice can) <b>11ish mpg</b>

Almost the same setup as me, minus the over bore, stock 75 jetting, no fuel cooler, have 1.5" longtube headers and glasspacks, I get around 12mpg on average.

Matt Man · 07-06-2010, 12:44 AM

454 long tube headers besides that its stock about 10mpg

bikes&bowties · 07-06-2010, 12:50 AM

250hp crate 350 with long tube headers.
sm465 with np205
3.73 gears

other things are a flatbed (not sure if it helps or hurts) and 35x12.5 inch mud terrains... I get approximately 10mpg with my foot in it 80% of the time... generally 65mph+

irishman999 · 07-06-2010, 12:54 AM

Where's the 305? Seriously everyone hates that engine that much?

68Timber · 07-06-2010, 12:58 AM

Mine's a toy, I don't give a damn what the mpg is.

spinem · 07-06-2010, 01:01 AM

Quote:

Originally Posted by Matt Man

454 long tube headers besides that its stock about 10mpg

wow, not bad.... hp/torque numbers????

Quote:

Originally Posted by bikes&bowties

250hp crate 350 with long tube headers.
sm465 with np205
3.73 gears

other things are a flatbed (not sure if it helps or hurts) and 35x12.5 inch mud terrains... I get approximately 10mpg with my foot in it 80% of the time... generally 65mph+

well flat bed should help, u got a stick so u can coast and guage shift points better than we can /w/ our 3 speeds.... nice and thanks for the imput... just another inspiritation to convert to stick!!!!

Quote:

Originally Posted by irishman999

Where's the 305? Seriously everyone hates that engine that much?

haha honestly, i forgot about the 305, they were the least sold motor of its time out here n cali when every one was hauling hay at day and disco by night..... i left out the 327 as well.... no meaness intended!!!

i wish i could edit polls

*jake wells* · 07-06-2010, 01:17 AM

mine is a stock 454 and it gets 10

BigRed76 · 07-06-2010, 01:23 AM

bone stock 350 w/K&N air filter rollin on 31's, was gettin 14 mpg through the winter but the carb needs a rebuild and doesn't do good in the summer heat so now im down to 12.

flamingbig10 · 07-06-2010, 01:24 AM

I get about 5 to 7 in town with a 350 but that's all in town driving with stop in go traffic and a few jack rabbit starts

spinem · 07-06-2010, 01:30 AM

Quote:

Originally Posted by flamingbig10

I get about 5 to 7 in town with a 350 but that's all in town driving with stop in go traffic and a few jack rabbit starts

WOAH!! humidity is killn ya!

*jake wells* · 07-06-2010, 01:51 AM

my last truck wasnt any better it got 13 city 15 highway it was a 305 2bbl th350
my new truck gets 8 city 11 highway

bikes&bowties · 07-06-2010, 02:15 AM

Quote:

Originally Posted by spinem

well flat bed should help, u got a stick so u can coast and guage shift points better than we can /w/ our 3 speeds.... nice and thanks for the imput... just another inspiritation to convert to stick!!!!

my rear end ratio isnt great for the transmission and tires and my motor doesnt have enough torque to pull 3rd (top gear) super strong... when i shift (depending at what rpm i shift) it drops to 1200-1600rpm. and its reletively slow till it hits the 2k mark and then it pulls really strong... i know the 3.73's are helping my mileage though cause when im doing like 75 its only at 2500rpm and 2100rpm when im doing 60-65.... I did the conversion and i wouldnt consider it a weekend transmission swap... its kinda in depth but only barely...

Hoffman65burb · 07-06-2010, 02:26 AM

454 turbo 400 373, 5ish..... (hard for me to keep my foot out of it

)

GMC91 · 07-06-2010, 02:28 AM

350 TH350 3:08s...8MPG. But Im 17 and sling the truck sideways at every turn.

Blake_H · 07-06-2010, 02:54 AM

'87 4x4 w/tbi 350. Motor only has about 200 miles on it, but so far I'm getting about 14 mpg. I have no idea what my gear ratio is. PO damaged RPO sheet in glove box. So far, I'm pretty content.

My '86 cc 454 got 5 mpg towing our new trailer back from K.C. 2 summers ago when gas was $4.00 a gallon. That was fun.

Matt Man · 07-06-2010, 03:36 AM

Quote:

Originally Posted by jake wells

my last truck wasnt any better it got 13 city 15 highway it was a 305 2bbl th350
my new truck gets 8 city 11 highway

have to agree with this post mine gets about that

**78 Big10 454** · 07-06-2010, 03:39 AM

Stock 454 with long tube headers and dual cats/exhaust - 10 mpg, no matter what.

thumper80 · 07-06-2010, 08:19 AM

my d/d is a stock 454 and I don't care about mpg .

Cherub · 07-06-2010, 09:28 AM

364 6.0l getting 18 to 20mpg

**N2TRUX** · 07-06-2010, 09:43 AM

My 77 has a GM Ramjet 350 that rated at 350 hp and 400 TQ. I am currently running 3.08 gears with a 700r4. How does it do on MPG? I have no idea, but I can tell you it puts a smile on my face every time I drive it. So I guess mine is getting at least 50 SPG (smile per gallon)....

swb85 · 07-06-2010, 10:04 AM

450hp/450tq 383ci with muncie 4spd, 3.42's and 28" tires and I average 14-15mpg mixed driving. I'll get 17 on a highway trip if I stay under 70mph. Someday I'll put a tko500 in it and start knocking down 20mpg.

*78 Chevyrado* · 07-06-2010, 10:19 AM

Original 350ci 400trans 3.73 gears 5000# 78 c20. I get 15mpg avaerage. **I get BETTER mileage (about 2MPG) on the freeway with the windows UP and the AC on then riding with the windows down... might be something to try for all the NON-OD people.

View Poll Results: Dis-Placed-Ment------what do you drive?
\| 6	3	4.00%
350	50	66.67%
383	2	2.67%
454	10	13.33%
other (please list)	11	14.67%
Multiple Choice Poll. Voters: 75. You may not vote on this poll

07-06-2010, 12:24 AM	#1
spinem haha, ford guys... Join Date: Feb 2007 Location: Visalia, CA Posts: 576	yet another MPG thread What mileage do you get in your: straight 6? 350? 383? 454?

07-06-2010, 12:27 AM	#2
spinem haha, ford guys... Join Date: Feb 2007 Location: Visalia, CA Posts: 576	Re: yet another MPG thread 350 bored .30 over, rv cam, stock carb /w/ 1972 jets (5%more fuel)...fuel cooler(ice can) <b>11ish mpg</b>

07-06-2010, 12:35 AM	#3
spinem haha, ford guys... Join Date: Feb 2007 Location: Visalia, CA Posts: 576	Re: yet another MPG thread mpg any one?????

07-06-2010, 12:44 AM	#5
Matt Man Registered User Join Date: Oct 2009 Location: Buhl, Idaho Posts: 1,438	Re: yet another MPG thread 454 long tube headers besides that its stock about 10mpg __________________ 86 c30 crew cab dually 454/400 4/6 drop SOLD 1-8-11 1981 chevy K10 short Bed Scottsdale SOLD 10-26-2020 67 GMC Stepside Straight six/3 on the tree "The Peach" 2020 Silverado Double Cab LT Z71 5.3 8 speed Daily Driver K10 build http://67-72chevytrucks.com/vboard/s...d.php?t=671934 The Peach build http://67-72chevytrucks.com/vboard/s...d.php?t=733903

07-06-2010, 12:50 AM	#6
bikes&bowties Registered User Join Date: May 2009 Location: Washington Posts: 663	Re: yet another MPG thread 250hp crate 350 with long tube headers. sm465 with np205 3.73 gears other things are a flatbed (not sure if it helps or hurts) and 35x12.5 inch mud terrains... I get approximately 10mpg with my foot in it 80% of the time... generally 65mph+

07-06-2010, 12:54 AM	#7
irishman999 Registered User Join Date: May 2010 Location: Reno Ne-VAH-da Posts: 594	Re: yet another MPG thread Where's the 305? Seriously everyone hates that engine that much?

07-06-2010, 12:58 AM	#8
68Timber I know the pieces fit Join Date: Nov 2007 Location: MONTGOMERY, AL Posts: 5,523	Re: yet another MPG thread Mine's a toy, I don't give a damn what the mpg is. __________________ John 79 2wd Blazer (Bruiser) 85 M1009 Blazer (Sarge) build 74 Honda Z50 build

07-06-2010, 01:17 AM	#10
jake wells Account Suspended Join Date: Sep 2009 Location: No Longer Here Posts: 352	Re: yet another MPG thread mine is a stock 454 and it gets 10

07-06-2010, 01:23 AM	#11
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: yet another MPG thread bone stock 350 w/K&N air filter rollin on 31's, was gettin 14 mpg through the winter but the carb needs a rebuild and doesn't do good in the summer heat so now im down to 12. __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

07-06-2010, 01:24 AM	#12
flamingbig10 6.0 powered square Join Date: Feb 2008 Location: Mesquite texas Posts: 3,459	Re: yet another MPG thread I get about 5 to 7 in town with a 350 but that's all in town driving with stop in go traffic and a few jack rabbit starts __________________ Aaron 1980 c-10 short bed lowered, cammed 6.0, 4l80e 3600 stall, smp tune, wilwoods, and flames best time so far best et 7.86 @87 on motor 7.57 90 on a 75 shot Build http://67-72chevytrucks.com/vboard/s...d.php?t=283326 Last edited by flamingbig10; 07-06-2010 at 01:25 AM.

07-06-2010, 01:51 AM	#14
jake wells Account Suspended Join Date: Sep 2009 Location: No Longer Here Posts: 352	Re: yet another MPG thread my last truck wasnt any better it got 13 city 15 highway it was a 305 2bbl th350 my new truck gets 8 city 11 highway

07-06-2010, 02:26 AM	#16
Hoffman65burb Registered User Join Date: Jul 2008 Location: Vancouver BC Posts: 448	Re: yet another MPG thread 454 turbo 400 373, 5ish..... (hard for me to keep my foot out of it ) __________________ 1978 GMC Jimmy 454bbc Turbo400 NP205 3.73 gears 4inch lift 33's

07-06-2010, 02:28 AM	#17
GMC91 Always trouble Join Date: Jul 2009 Location: Hartsellle, Al Posts: 1,111	Re: yet another MPG thread 350 TH350 3:08s...8MPG. But Im 17 and sling the truck sideways at every turn. __________________ 91 Silverado Regular cab, 2wd, swb-project truck 97 Silverado Extended cab, 2wd, swb-driver

07-06-2010, 02:54 AM	#18
Blake_H Registered User Join Date: Oct 2009 Location: Redmond, OR Posts: 217	Re: yet another MPG thread '87 4x4 w/tbi 350. Motor only has about 200 miles on it, but so far I'm getting about 14 mpg. I have no idea what my gear ratio is. PO damaged RPO sheet in glove box. So far, I'm pretty content. My '86 cc 454 got 5 mpg towing our new trailer back from K.C. 2 summers ago when gas was $4.00 a gallon. That was fun.



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07-06-2010, 03:39 AM	#20
78 Big10 454 78 Big10 454 Join Date: Jul 2008 Location: Pismo Beach, CA Posts: 838	Re: yet another MPG thread Stock 454 with long tube headers and dual cats/exhaust - 10 mpg, no matter what.

07-06-2010, 08:19 AM	#21
thumper80 Registered User Join Date: Dec 2009 Location: Medicine Hat , Alberta Posts: 9	Re: yet another MPG thread my d/d is a stock 454 and I don't care about mpg .

07-06-2010, 09:28 AM	#22
Cherub Registered User Join Date: Feb 2008 Location: Houston Posts: 970	Re: yet another MPG thread 364 6.0l getting 18 to 20mpg __________________ 2014 LTZ Z71 Silverado 82 C15 LQ4/4L80E Conversion 78 Suburban build (SOLD) 83 4x4 Suburban(SOLD) 82 C15 (my first truck)

07-06-2010, 09:43 AM	#23
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: yet another MPG thread My 77 has a GM Ramjet 350 that rated at 350 hp and 400 TQ. I am currently running 3.08 gears with a 700r4. How does it do on MPG? I have no idea, but I can tell you it puts a smile on my face every time I drive it. So I guess mine is getting at least 50 SPG (smile per gallon).... __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

07-06-2010, 10:04 AM	#24
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: yet another MPG thread 450hp/450tq 383ci with muncie 4spd, 3.42's and 28" tires and I average 14-15mpg mixed driving. I'll get 17 on a highway trip if I stay under 70mph. Someday I'll put a tko500 in it and start knocking down 20mpg. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

07-06-2010, 10:19 AM	#25
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: yet another MPG thread Original 350ci 400trans 3.73 gears 5000# 78 c20. I get 15mpg avaerage. *I get BETTER mileage (about 2MPG) on the freeway with the windows UP and the AC on then riding with the windows down... might be something to try for all the NON-OD people. Last edited by 78 Chevyrado; 07-06-2010 at 10:20 AM.*

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