Honest answers for your Longbed 350 Mileage? - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

grinch4om · 01-01-2010, 11:04 AM

305,700R4, 3:42=13.5 MPG...ticked off, decided if that is the mileage, might as well have fun...454,700R4,3:42, intake, holley spreadbore,headers, 3" exhaust=13.5 MPG, no curb is safe 84 shortbed

Chief Bail · 01-01-2010, 01:54 PM

2bit

Here is a honest answer to your question. I DONT KNOW...hope it made you laugh.

Benelli · 01-01-2010, 02:01 PM

When my pick up was as close to stock as it "ever" was, with a 168,xxx miles, headers, 2 1/4in exhaust, a mild RV cam, full time NP203 and TH350. Everything stock...it would pull off 6.5 MPG, everywhere. I imagine highway gas was sucked down by the full time 4wd, and I really kept my foot out of it in-town because more or less it ran like crap.

68 TT · 01-05-2010, 12:30 PM

Quote:

Originally Posted by 2bits

Oh and 68 TT... No offense but I gotta set you straight. I said the glove box sticker did NOT say what gear ratio I had so it would be real hard for me to say it was right when I said it didn't exist, and you also replied to me saying I understood that I misread to tell me that I misread. So read what you are replying to. Thanks

I wasn't talking to you or replying to your post.

I was making a general statement that just happened to be the next post after yours that going by the glove box sticker alone is not always correct. These trucks are around 30 years old so they could have gone through several gear changes by now, none of which are on the sticker. Mine has had different gears in it since it was a year old.

Mr Pops · 01-05-2010, 04:17 PM

I used to have an 85 GMC Sierra Classic halfton 2wd longbox, 350, turbo 400, 3:07 gears, heavy foot, I got 10 mpg. But the truck never ran right. I've heard that 1985 was the worst year for smog crap and that 86 was different again but better.

I currently drive a 1990 Chev V3500 crewcab 4X4 with a 350 and a turbo 400 and 35" tires. Its 6000 lbs. Its also gets 10mpg regardless of how I drive it.

73step · 01-05-2010, 05:08 PM

73 stepside fresh rebuilt 350 q-jet 600 longtubes (the way i got the truck) 700 r4 3.73 gears 235-75-15 maybe 8-10 mpg i know there is something wrong i need to look into it . any ideas??

ToughBowtieTruck · 01-05-2010, 06:44 PM

I am running a 355 with Edelbrock goodies, hooked to an sm465/np205. I have 4.10 gears and 33" tires.

It's in a '77, and besides the newer clutch fan, I am running the stock air cleaner on top of the Edelbrock carburetor, and stock exhaust manifolds.

If I stay under 70 mph, I get 14 mpg.

Even though I have 33" tires, the 4.10 gears let the engine turn them without effort. After all, it's running about 2,600 rpms at 60 mph.

Sniper X · 01-05-2010, 07:16 PM

stock rebuilt 4 bolt main 350, granny low 4 (3) speed, posi rear, 1974 long bed. I get about 18 on the road if under 70mph, and probably 13~15 in town.

Sniper X · 01-05-2010, 07:17 PM

Quote:

Originally Posted by 73step

73 stepside fresh rebuilt 350 q-jet 600 longtubes (the way i got the truck) 700 r4 3.73 gears 235-75-15 maybe 8-10 mpg i know there is something wrong i need to look into it . any ideas??

I think the problem may lie in your right foot.....

73step · 01-05-2010, 08:34 PM

Quote:

Originally Posted by Sniper X

I think the problem may lie in your right foot.....

well to be honest i broke my right foot off back in 05 and the doctor said he put alot of plates and screws and hardware in the ankle so maybe my rite foot is a little heavier but hey what can i do lol

01-01-2010, 11:04 AM	#51
grinch4om dang its hot Join Date: Nov 2006 Location: frankfort kentucky Posts: 1,349	Re: Honest answers for your Longbed 350 Mileage? 305,700R4, 3:42=13.5 MPG...ticked off, decided if that is the mileage, might as well have fun...454,700R4,3:42, intake, holley spreadbore,headers, 3" exhaust=13.5 MPG, no curb is safe 84 shortbed Last edited by grinch4om; 01-01-2010 at 11:05 AM.

01-01-2010, 01:54 PM	#52
Chief Bail Registered User Join Date: Jun 2009 Location: winston-salem n.c. Posts: 475	Re: Honest answers for your Longbed 350 Mileage? 2bit Here is a honest answer to your question. I DONT KNOW...hope it made you laugh. __________________ 1979 GMC Sierra 15 1986 Danco Rollback 454 4spd 1986 Jerr-Dan Rollback 454 4spd 1978 GMC Jerr-Dan 454 Tonawanda 4spd FOR SALE 85 Chevy Wrecker 454 4spd AATAC Always a Friend...Michael

01-01-2010, 02:01 PM	#53
Benelli Watchin the rust grow Join Date: Oct 2008 Location: Western Nebraska Posts: 950	Re: Honest answers for your Longbed 350 Mileage? When my pick up was as close to stock as it "ever" was, with a 168,xxx miles, headers, 2 1/4in exhaust, a mild RV cam, full time NP203 and TH350. Everything stock...it would pull off 6.5 MPG, everywhere. I imagine highway gas was sucked down by the full time 4wd, and I really kept my foot out of it in-town because more or less it ran like crap. __________________ 1979 Chevy K10 (H/D Front end) - 350 w/ Holley Truck Avenger, Weinald Intake manifold, headers, bored .060 over, mild cam, Built up TH350 (TranStar Shift kit) with a part-timed NP203 t-case SOLD ($3,000) 1997 Chevy Silverado 1500 - 4.3 vortec, extended cab, 21 highway MPG, stock. "Red" SOLD ($3,000) 1987 Toyota 4wd Pick-up - work in progress, future DD SOLD ($1,850) 1998 Dodge Ram 2500 Cummins 5spd Quad cab - old 12 valve with some work done 2004 Chevy Silverado - Black, 4x4, 5.3L, stock for now Underneath that rust is a heart of gold

01-05-2010, 04:17 PM	#55
Mr Pops Ridin' Dirty Join Date: Oct 2009 Location: Ardrossan Alberta Canada Posts: 2,193	Re: Honest answers for your Longbed 350 Mileage? I used to have an 85 GMC Sierra Classic halfton 2wd longbox, 350, turbo 400, 3:07 gears, heavy foot, I got 10 mpg. But the truck never ran right. I've heard that 1985 was the worst year for smog crap and that 86 was different again but better. I currently drive a 1990 Chev V3500 crewcab 4X4 with a 350 and a turbo 400 and 35" tires. Its 6000 lbs. Its also gets 10mpg regardless of how I drive it. __________________ 1978 C3500 Crewcab (Project) 1979 C2500 Crewcab (Driver/project) 1988 R2500 Crewcab (Driver) 1988 V3500 Crewcab 1988 R2500 Crewcab (Mint, Ex Fire Dept) 1968 Chev Suburban (4x4 conversion) LINK 1970 Chev C20 Suburban (driver/cruiser)LINK 2005 Impala (Incognito vehicle) 2004 Yukon XL Denali (Kid hauler) 1947 Case tractor Facebook Page(1000's of pictures of GM cars and trucks organized into albums) YouTube Channel

01-05-2010, 05:08 PM	#56
73step Registered User Join Date: Apr 2009 Location: hurlock md Posts: 82	Re: Honest answers for your Longbed 350 Mileage? 73 stepside fresh rebuilt 350 q-jet 600 longtubes (the way i got the truck) 700 r4 3.73 gears 235-75-15 maybe 8-10 mpg i know there is something wrong i need to look into it . any ideas??

01-05-2010, 06:44 PM	#57
ToughBowtieTruck Registered User Join Date: Dec 2009 Location: MI Posts: 111	Re: Honest answers for your Longbed 350 Mileage? I am running a 355 with Edelbrock goodies, hooked to an sm465/np205. I have 4.10 gears and 33" tires. It's in a '77, and besides the newer clutch fan, I am running the stock air cleaner on top of the Edelbrock carburetor, and stock exhaust manifolds. If I stay under 70 mph, I get 14 mpg. Even though I have 33" tires, the 4.10 gears let the engine turn them without effort. After all, it's running about 2,600 rpms at 60 mph. __________________ -Josh "Mr. Simpson, there are thousands of people like you with no discernible talent." Duff World Records Division "Yeah, they're called Congress!!" -Homer Simpson

01-05-2010, 07:16 PM	#58
Sniper X Registered User Join Date: Aug 2009 Location: Albuquerque New mexico Posts: 169	Re: Honest answers for your Longbed 350 Mileage? stock rebuilt 4 bolt main 350, granny low 4 (3) speed, posi rear, 1974 long bed. I get about 18 on the road if under 70mph, and probably 13~15 in town.



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