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

chevy355 · 08-06-2012, 03:11 PM

i found a 454 at the local pick and pull in a '89 suburban. i know they like there gas but i was curious what kind of gas mileage i would get with a 454 carb,nv4500 trans,4.10 ratio, and 33 inch tire?

INSIDIOUS '86 · 08-06-2012, 03:46 PM

What mileage? Hope you have two tanks!
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**Corts60** · 08-06-2012, 03:50 PM

I think it might be mathematically easier to calculate that combo in feet per gallon. Haha.

Realistically though, you can probably expect 8-10 mpg.
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KQQL IT · 08-06-2012, 06:59 PM

Every 454 ive been around gets 10 driving right. Dramatically less heavy footed
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*C-10 simplex* · 08-06-2012, 07:24 PM

i've stated it before. i will state it again:

BIG BLOCK ON THE STREET = FINANCIAL SUICIDE

i think the only way you can get any decent mileage out of a big block is to utilize very high compression----14.1-to-1 if that's even possible----which would necessitate using water injection (or as high compression as possible), headers and hi-gear such as 2.56.

chevy355 · 08-06-2012, 07:42 PM

well now im running 355 with 11.5 to1 comp ratio through a sm465, 308 gear ratio and 33 inch tires and im running 7.5 mpg and thats driving with a light foot. the reason i wanted a 454 was for torque

meter swinger · 08-06-2012, 07:48 PM

My TBI crew dually gets around 9mpg/empty/loaded/pulling seems not to make much difference. I get a little better on flat hiway and a little worse going over the mountain passes here in WA.
FWIW It is thirsty but then im not paying making payments on a 50k $$$ diesel truck i would only drive every other weekend. Total operating cost is actually pretty low if you look at it that way.

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*C-10 simplex* · 08-06-2012, 07:49 PM

What are trying to do? Towing?

i8tokyo · 08-06-2012, 08:10 PM

My 82 C-20, 454, TH-400, 4:10 gets 10.2 mpg whether I'm towing, loaded down or empty. My 1998 C3500 ext-cab dually, TBI 454, 4L80, 4:10 gets 10.8 empty and 8.8 towing a 8200lb trailer and boat.

chevy355 · 08-06-2012, 08:16 PM

Quote:

Originally Posted by C-10 simplex

What are trying to do? Towing?

i live on a dairy farm so it tows wagons and a trailer for my classic tractors

**78 Big10 454** · 08-06-2012, 08:57 PM

Street/highway/empty/loaded/uphill/downhill/sea-level/high altitude = 10mpg. Period.

russgt · 08-06-2012, 09:01 PM

Quote:

Originally Posted by 78 Big10 454

Street/highway/empty/loaded/uphill/downhill/sea-level/high altitude = 10mpg. Period.

If you shut it off going downhill you might get a little better, LOL

THE "10" SILVERADO · 08-06-2012, 09:05 PM

Had a 454 in my stepdads 67 Chevelle before we sold it. Edelbrock intake, Holly Carb, 3:73 gears and TH400 later swapped to a Muncie 4 speed. Got pretty much 8 the whole time. Maybe 10 downhill, not running, with a tailwind and on a trailer....you get the point....
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100%Chevy · 08-06-2012, 10:17 PM

About the same here.
82,4x4,454,t-400,with 373 rear.33x12.50 tires.
The only good thing is,it gets the same milage up hill or down!
With or without our 28'travel trailer.
9 to 11 per gallon is about normal.
BUT,nothing beats it for towing!
Mike.

/

**78 Big10 454** · 08-06-2012, 10:53 PM

Quote:

Originally Posted by russgt

If you shut it off going downhill you might get a little better, LOL

But no power steering/brakes!

mopar346 · 08-06-2012, 11:03 PM

How bout the 2005ish 8.1 with an allison?

tucsonjwt · 08-07-2012, 01:08 AM

My 83 C20 2wd reg cab LB best mileage with gear vendor used frequently got 11 mpg city, 13 mpg highway. Realistically, I get 9 mpg city in constant stop and go traffic (the only place I drive now.) The lowest I got was 8 mpg city hauling dirt in my dump conversion. However, the 76 C20 350/350 did not get any better gas mileage. I think when you are hauling around an extra 1000 lbs. of dead weight compared to a 1/2 ton you are not going to get good gas mileage even if you had a 4 cylinder.

king-918 · 08-07-2012, 01:31 AM

2 gallons = 1 mile

cory d · 08-07-2012, 02:17 AM

get the nv4500, leave the 454

andrewmp6 · 08-07-2012, 02:30 AM

Why not do a diesel swap? a 6.2 will bolt in have enough torque and get better mileage.

INSIDIOUS '86 · 08-07-2012, 02:30 AM

Ok here I propose a idea that isn't employed often

Cummins 6bt swap, the torque and fuel mileage you need and planty are available
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redsled87 · 08-07-2012, 07:35 AM

Guess I'm screwed then with the 496 that I built.

Oh well, I built it for speed not for economy. I know that some stock 396's that get good mileage. My parents have a '66 Caprice that is a bone stock 325hp that, they have gotten 20mpg out of. But it also has 2.73 gears in it too.

BigBlocksRule · 08-07-2012, 07:41 AM

If you can set it up in front of a 4L80E, it will help a lot!

And for all you diesel swap supporters...I can completely overhaul a 454 for less money than you can have a diesel injection system rebuilt. And if I add a turbo similar to what comes stock on most diesel engines, I'll out pull 'em and shave 400lbs off the nose of my truck.

redsled87 · 08-07-2012, 07:48 AM

Quote:

Originally Posted by BigBlocksRule

If you can set it up in front of a 4L80E, it will help a lot!

And for all you diesel swap supporters...I can completely overhaul a 454 for less money than you can have a diesel injection system rebuilt. And if I add a turbo similar to what comes stock on most diesel engines, I'll out pull 'em and shave 400lbs off the nose of my truck.

I wouldn't swap to a diesel either. For what he is doing, its not worth it. Alot of money for nothing. Maybe he could find an '01 and up 8.1 instead.

*C-10 simplex* · 08-07-2012, 09:06 AM

Are you going to tow the tractors off-farm or on-farm?

08-06-2012, 03:11 PM	#1
chevy355 Registered User Join Date: Jul 2011 Location: martville.ny Posts: 18	454 mileage i found a 454 at the local pick and pull in a '89 suburban. i know they like there gas but i was curious what kind of gas mileage i would get with a 454 carb,nv4500 trans,4.10 ratio, and 33 inch tire? __________________ Matt 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt

08-06-2012, 03:46 PM	#2
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: 454 mileage What mileage? Hope you have two tanks! Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

08-06-2012, 03:50 PM	#3
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,672	Re: 454 mileage I think it might be mathematically easier to calculate that combo in feet per gallon. Haha. Realistically though, you can probably expect 8-10 mpg. Posted via Mobile Device __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725

08-06-2012, 06:59 PM	#4
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,142	Re: 454 mileage Every 454 ive been around gets 10 driving right. Dramatically less heavy footed Posted via Mobile Device __________________ " That didnt make it any newer " " Dont antique the equipment "

08-06-2012, 07:24 PM	#5
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: 454 mileage i've stated it before. i will state it again: BIG BLOCK ON THE STREET = FINANCIAL SUICIDE i think the only way you can get any decent mileage out of a big block is to utilize very high compression----14.1-to-1 if that's even possible----which would necessitate using water injection (or as high compression as possible), headers and hi-gear such as 2.56.

08-06-2012, 07:42 PM	#6
chevy355 Registered User Join Date: Jul 2011 Location: martville.ny Posts: 18	Re: 454 mileage well now im running 355 with 11.5 to1 comp ratio through a sm465, 308 gear ratio and 33 inch tires and im running 7.5 mpg and thats driving with a light foot. the reason i wanted a 454 was for torque __________________ Matt 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt

08-06-2012, 07:48 PM	#7
meter swinger Registered User Join Date: Apr 2009 Location: Kennewick WA. Posts: 1,437	Re: 454 mileage My TBI crew dually gets around 9mpg/empty/loaded/pulling seems not to make much difference. I get a little better on flat hiway and a little worse going over the mountain passes here in WA. FWIW It is thirsty but then im not paying making payments on a 50k $$$ diesel truck i would only drive every other weekend. Total operating cost is actually pretty low if you look at it that way. Posted via Mobile Device

08-06-2012, 07:49 PM	#8
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: 454 mileage What are trying to do? Towing?

08-06-2012, 08:10 PM	#9
i8tokyo Registered User Join Date: Aug 2010 Location: Olathe, KS Posts: 61	Re: 454 mileage My 82 C-20, 454, TH-400, 4:10 gets 10.2 mpg whether I'm towing, loaded down or empty. My 1998 C3500 ext-cab dually, TBI 454, 4L80, 4:10 gets 10.8 empty and 8.8 towing a 8200lb trailer and boat. __________________ 1982 C-20, 454, TH-400, PS, A/C, 71,000 miles 1978 C-20, 350, TH-400, PS, Non-A/C, 112,000 miles If it ain't broke, there is still probably room for improvement. Speed costs money, how fast do you want to go?

08-06-2012, 08:57 PM	#11
78 Big10 454 78 Big10 454 Join Date: Jul 2008 Location: Pismo Beach, CA Posts: 838	Re: 454 mileage Street/highway/empty/loaded/uphill/downhill/sea-level/high altitude = 10mpg. Period. __________________ 1978 Chevy SWB C-10 2WD 454/400

08-06-2012, 09:05 PM	#13
THE "10" SILVERADO Registered User Join Date: Sep 2010 Location: Marble Falls, TX Posts: 1,575	Re: 454 mileage Had a 454 in my stepdads 67 Chevelle before we sold it. Edelbrock intake, Holly Carb, 3:73 gears and TH400 later swapped to a Muncie 4 speed. Got pretty much 8 the whole time. Maybe 10 downhill, not running, with a tailwind and on a trailer....you get the point.... Posted via Mobile Device __________________ Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9

08-06-2012, 10:17 PM	#14
100%Chevy Registered User Join Date: Jun 2008 Location: Moss Point,Ms. Posts: 1,439	Re: 454 mileage About the same here. 82,4x4,454,t-400,with 373 rear.33x12.50 tires. The only good thing is,it gets the same milage up hill or down! With or without our 28'travel trailer. 9 to 11 per gallon is about normal. BUT,nothing beats it for towing! Mike./

08-06-2012, 11:03 PM	#16
mopar346 Registered User Join Date: Jan 2011 Location: Quincy, FL Posts: 533	Re: 454 mileage How bout the 2005ish 8.1 with an allison?

08-07-2012, 01:08 AM	#17
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,188	Re: 454 mileage My 83 C20 2wd reg cab LB best mileage with gear vendor used frequently got 11 mpg city, 13 mpg highway. Realistically, I get 9 mpg city in constant stop and go traffic (the only place I drive now.) The lowest I got was 8 mpg city hauling dirt in my dump conversion. However, the 76 C20 350/350 did not get any better gas mileage. I think when you are hauling around an extra 1000 lbs. of dead weight compared to a 1/2 ton you are not going to get good gas mileage even if you had a 4 cylinder.

08-07-2012, 01:31 AM	#18
king-918 Registered User Join Date: Nov 2011 Location: Oklahoma City Oklahoma Posts: 1,054	Re: 454 mileage 2 gallons = 1 mile



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08-07-2012, 02:17 AM	#19
cory d Registered User Join Date: Dec 2011 Location: Arlington WA Posts: 1,728	Re: 454 mileage get the nv4500, leave the 454 __________________ GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread

08-07-2012, 02:30 AM	#20
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: 454 mileage Why not do a diesel swap? a 6.2 will bolt in have enough torque and get better mileage.

08-07-2012, 02:30 AM	#21
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: 454 mileage Ok here I propose a idea that isn't employed often Cummins 6bt swap, the torque and fuel mileage you need and planty are available Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

08-07-2012, 07:35 AM	#22
redsled87 Registered User Join Date: Dec 2011 Location: Lanc Co PA Posts: 226	Re: 454 mileage Guess I'm screwed then with the 496 that I built. Oh well, I built it for speed not for economy. I know that some stock 396's that get good mileage. My parents have a '66 Caprice that is a bone stock 325hp that, they have gotten 20mpg out of. But it also has 2.73 gears in it too. __________________ 1987 R10 Pump Gas 496/TH375 Best 1/4 pass to date 60' 1.49 1/4 10.93 MPH 120

08-07-2012, 07:41 AM	#23
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 454 mileage If you can set it up in front of a 4L80E, it will help a lot! And for all you diesel swap supporters...I can completely overhaul a 454 for less money than you can have a diesel injection system rebuilt. And if I add a turbo similar to what comes stock on most diesel engines, I'll out pull 'em and shave 400lbs off the nose of my truck.

08-07-2012, 09:06 AM	#25
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: 454 mileage Are you going to tow the tractors off-farm or on-farm?

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