gas mileage question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**68350** · 03-19-2006, 03:24 PM

what kind of gas mileage would a 350 get with 3.92 gears and 285 tires? thanks

cdowns · 03-19-2006, 03:29 PM

alot depends on the size of a right foot

PanelDeland · 03-19-2006, 03:31 PM

Also it will get better milage in a VW than a Peterbuilt.

HotRod71 · 03-19-2006, 04:16 PM

What transmission too.

Longhorn Man · 03-19-2006, 04:43 PM

I say 10 to 12 MPG.
http://67-72chevytrucks.com/vboard/s...d.php?t=172346
That's what most ppl get in these trucks regardless of the combo.

**68350** · 03-19-2006, 04:54 PM

well, as for the right foot, it is about a size 16. as for the tranny it is a 4 speed automatic and the motor has fuel injection. It has a 2 in lift also.

**Stocker** · 03-19-2006, 05:00 PM

There are way too many variable for an accurate answer, but Andy's probably pretty close. You live in flat country, and that helps some. Headwinds, higher speeds, driving styles etc all affect mpg.

JAKES 68GMC · 03-19-2006, 05:46 PM

I never gotten over 3 or 4mpg with the V6, from what I've observed.

HotRod71 · 03-19-2006, 06:01 PM

3-4????? Man that is terrible. I was complaining about 13.5 in mine with a 350 and 700R4.

JAKES 68GMC · 03-19-2006, 06:19 PM

Hehe. There another side to the story.

The carb is WAYYYYYYYYYYYYY WAYYYYYY too rich. Dumps more fuel out of the exhaust than the engine burns.

If I get a new carb, and I'd probably be up with you guys at 12mpg or so.

TP from Cntl PA · 03-19-2006, 08:52 PM

Quote:

Originally Posted by JAKES 68GMC

Hehe. There another side to the story.

The carb is WAYYYYYYYYYYYYY WAYYYYYY too rich. Dumps more fuel out of the exhaust than the engine burns.

If I get a new carb, and I'd probably be up with you guys at 12mpg or so.

Heck, my V-6 gets way better than my Big Block, and gets just a tad less than the 350 I had in my other truck................BUT, it makes more useable power than either of them. Around 14 or so.....Goes down quickly when (Over)Loaded.

15-16 with the 350/3spd

454/4spd 10 at best, and its a true turd for the amount of fuel it uses..........If it didn't have 4x4, I'd honestly unload it. Sure makes me want to get the Cummins truck done, I can do better than triple what the 454 gets and have LOADS more power for running loaded.

davidh · 03-19-2006, 08:58 PM

Quote:

Originally Posted by JAKES 68GMC

I never gotten over 3 or 4mpg with the V6, from what I've observed.

Gulp, Gulp, Gulp, With gas shooting back over 2.5/gallon that carb would pay for itself in no time.

Fred T · 03-19-2006, 08:59 PM

You should be able to get around 15 if it's set up right. So much depends on cam, carb and ignition combo.

Jake, I used to get 10 mpg out of 2 tons with the 351. In the 5 ton with the 478 I got around 5. Sounds like someone could hook up to your exhaust and use your wasted fuel to power another truck.

JAKES 68GMC · 03-19-2006, 09:08 PM

Quote:

Originally Posted by TP from Cntl PA

Heck, my V-6 gets way better than my Big Block, and gets just a tad less than the 350 I had in my other truck................BUT, it makes more useable power than either of them. Around 14 or so.....Goes down quickly when (Over)Loaded.

REALLY???????? And thats in a one ton, too. Is that just cruising around town, or back road expiditions? Suppose I could get that in a 4x4?

Fred, your right. You could almost put a bucket underneath the pipes and get fuel. Now you and TP have me wondering about my fuel mileage.

TP from Cntl PA · 03-19-2006, 10:41 PM

Quote:

Originally Posted by JAKES 68GMC

REALLY???????? And thats in a one ton, too. Is that just cruising around town, or back road expiditions? Suppose I could get that in a 4x4?

1/2, 3/4, or 1-ton, I honestly don't think it makes too much of a difference............They scale to close to make a huge difference. I don't cruise around town to begin with, and if I did I definitely wouldn't do it in a rough riding truck.........That fuel figure is for township roads, and state roads, 45 mph and under. Running light...........Of-course, I only used it like that a few times while we had the C-10 down for oil pan gasket.........Now, I don't get it out unless I am running loaded. And with our hills and the weight I load to, it does drop off quickly............Lugging it in 3rd gear consumes alot of fuel. A super hard pull I maybe way down in 2nd............So I honestly don't see that good of mileage with it anymore. Sounds to me like you need to work the Stromberg over, or learn how to drive it right.

JAKES 68GMC · 03-20-2006, 04:36 PM

Ditch the Stromjunk and put on a Holley 500 is what I'm going to do. Stromberg sticks sometimes at idle. Sometimes it's 400 rpm, other times 1000,other times 600.
I do lug it in third a lot. Thats WAY too much fun, especially when you can floor it and it will take off quickly. Thanks for the info.

67ChevyRedneck · 03-20-2006, 04:42 PM

by 4 speed auto I'm assuming a 7 or 200R4 or a 4L60E. Those are some tall rear end gears. I run a 350 with 700R4 3.73 rear end and I've gotten around 13 city and 16 highway. With your lift I'd expect more like 11-12 city and 13-14 hwy.

03-19-2006, 03:24 PM	#1
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	gas mileage question what kind of gas mileage would a 350 get with 3.92 gears and 285 tires? thanks __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

03-19-2006, 03:29 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: gas mileage question alot depends on the size of a right foot __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-19-2006, 03:31 PM	#3
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	Re: gas mileage question Also it will get better milage in a VW than a Peterbuilt. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

03-19-2006, 04:16 PM	#4
HotRod71 Short, Fleet, Slammed, V8 Club Join Date: Mar 2006 Location: Kingsport,TN Posts: 450	Re: gas mileage question What transmission too. __________________ Bill 71 Chevy SWB Fleetside (WIP) www.4x4grace.com

03-19-2006, 04:43 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: gas mileage question I say 10 to 12 MPG. http://67-72chevytrucks.com/vboard/s...d.php?t=172346 That's what most ppl get in these trucks regardless of the combo.

03-19-2006, 04:54 PM	#6
68350 Senior Member Join Date: Jan 2002 Location: Williston, ND Posts: 2,999	Re: gas mileage question well, as for the right foot, it is about a size 16. as for the tranny it is a 4 speed automatic and the motor has fuel injection. It has a 2 in lift also. __________________ 68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi

03-19-2006, 05:00 PM	#7
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,595	Re: gas mileage question There are way too many variable for an accurate answer, but Andy's probably pretty close. You live in flat country, and that helps some. Headwinds, higher speeds, driving styles etc all affect mpg. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

03-19-2006, 05:46 PM	#8
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,212	Re: gas mileage question I never gotten over 3 or 4mpg with the V6, from what I've observed.

03-19-2006, 06:01 PM	#9
HotRod71 Short, Fleet, Slammed, V8 Club Join Date: Mar 2006 Location: Kingsport,TN Posts: 450	Re: gas mileage question 3-4????? Man that is terrible. I was complaining about 13.5 in mine with a 350 and 700R4. __________________ Bill 71 Chevy SWB Fleetside (WIP) www.4x4grace.com

03-19-2006, 06:19 PM	#10
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,212	Re: gas mileage question Hehe. There another side to the story. The carb is WAYYYYYYYYYYYYY WAYYYYYY too rich. Dumps more fuel out of the exhaust than the engine burns. If I get a new carb, and I'd probably be up with you guys at 12mpg or so. Last edited by JAKES 68GMC; 03-19-2006 at 06:20 PM.

03-19-2006, 08:59 PM	#13
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: gas mileage question You should be able to get around 15 if it's set up right. So much depends on cam, carb and ignition combo. Jake, I used to get 10 mpg out of 2 tons with the 351. In the 5 ton with the 478 I got around 5. Sounds like someone could hook up to your exhaust and use your wasted fuel to power another truck. __________________ Fred There is no such thing as too much cam...just not enough engine.

03-20-2006, 04:36 PM	#16
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,212	Re: gas mileage question Ditch the Stromjunk and put on a Holley 500 is what I'm going to do. Stromberg sticks sometimes at idle. Sometimes it's 400 rpm, other times 1000,other times 600. I do lug it in third a lot. Thats WAY too much fun, especially when you can floor it and it will take off quickly. Thanks for the info.

03-20-2006, 04:42 PM	#17
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: gas mileage question by 4 speed auto I'm assuming a 7 or 200R4 or a 4L60E. Those are some tall rear end gears. I run a 350 with 700R4 3.73 rear end and I've gotten around 13 city and 16 highway. With your lift I'd expect more like 11-12 city and 13-14 hwy. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.