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08-06-2012, 03:11 PM
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#1 |
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Registered User
Join Date: Jul 2011
Location: martville.ny
Posts: 18
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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?
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Matt 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt |
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08-06-2012, 03:46 PM
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#2 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: 454 mileage
What mileage? Hope you have two tanks!
Posted via Mobile Device
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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 |
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08-06-2012, 03:50 PM
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#3 |
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Just here to tinker
 
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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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
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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/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) |
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08-06-2012, 06:59 PM
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#4 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,254
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Re: 454 mileage
Every 454 ive been around gets 10 driving right. Dramatically less heavy footed
Posted via Mobile Device
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" That didnt make it any newer " " Dont antique the equipment " |
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08-06-2012, 07:24 PM
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#5 |
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Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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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. |
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08-06-2012, 07:42 PM
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#6 |
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Registered User
Join Date: Jul 2011
Location: martville.ny
Posts: 18
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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
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Matt 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt |
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08-06-2012, 07:49 PM
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#7 |
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Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: 454 mileage
What are trying to do? Towing?
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08-06-2012, 08:16 PM
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#8 | |
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Registered User
Join Date: Jul 2011
Location: martville.ny
Posts: 18
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Re: 454 mileage
Quote:
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Matt 1986 chevy K10 355, sm465/np208, 14FF/dana 44 1984 chevy K20 350, th400/np208, 14SF/10 bolt |
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08-06-2012, 07:48 PM
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#9 |
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Registered User
Join Date: Apr 2009
Location: Kennewick WA.
Posts: 1,437
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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 |
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08-06-2012, 08:10 PM
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#10 |
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Registered User
Join Date: Aug 2010
Location: Olathe, KS
Posts: 61
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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.
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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? |
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08-06-2012, 08:57 PM
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#11 |
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78 Big10 454
Join Date: Jul 2008
Location: Pismo Beach, CA
Posts: 839
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Re: 454 mileage
Street/highway/empty/loaded/uphill/downhill/sea-level/high altitude = 10mpg. Period.
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1978 Chevy SWB C-10 2WD 454/400 |
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08-06-2012, 09:01 PM
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#12 | |
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Registered User
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
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Re: 454 mileage
Quote:
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70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634 |
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08-06-2012, 10:53 PM
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#13 | |
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78 Big10 454
Join Date: Jul 2008
Location: Pismo Beach, CA
Posts: 839
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Re: 454 mileage
Quote:
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1978 Chevy SWB C-10 2WD 454/400 |
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08-06-2012, 09:05 PM
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#14 |
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Registered User
Join Date: Sep 2010
Location: Marble Falls, TX
Posts: 1,575
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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
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Michael Re-starting the neglected '77...http://67-72chevytrucks.com/vboard/s...=425464&page=9 |
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08-06-2012, 10:17 PM
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#15 |
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Registered User
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
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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. /
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08-06-2012, 11:03 PM
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#16 |
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Registered User
Join Date: Jan 2011
Location: Quincy, FL
Posts: 533
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Re: 454 mileage
How bout the 2005ish 8.1 with an allison?
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08-07-2012, 01:08 AM
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#17 |
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Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,189
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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.
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08-07-2012, 01:31 AM
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#18 |
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Registered User
Join Date: Nov 2011
Location: Oklahoma City Oklahoma
Posts: 1,056
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Re: 454 mileage
2 gallons = 1 mile
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08-07-2012, 02:17 AM
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#19 |
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Registered User
Join Date: Dec 2011
Location: Arlington WA
Posts: 1,728
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Re: 454 mileage
get the nv4500, leave the 454
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GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread |
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08-07-2012, 02:30 AM
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#20 |
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Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: 454 mileage
Why not do a diesel swap? a 6.2 will bolt in have enough torque and get better mileage.
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08-07-2012, 02:30 AM
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#21 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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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
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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 |
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08-07-2012, 07:35 AM
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#22 |
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Registered User
Join Date: Dec 2011
Location: Lanc Co PA
Posts: 226
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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.
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1987 R10 Pump Gas 496/TH375 Best 1/4 pass to date 60' 1.49 1/4 10.93 MPH 120 |
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08-07-2012, 07:41 AM
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#23 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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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. |
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08-07-2012, 07:48 AM
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#24 | |
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Registered User
Join Date: Dec 2011
Location: Lanc Co PA
Posts: 226
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Re: 454 mileage
Quote:
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1987 R10 Pump Gas 496/TH375 Best 1/4 pass to date 60' 1.49 1/4 10.93 MPH 120 |
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08-07-2012, 09:06 AM
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#25 |
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Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: 454 mileage
Are you going to tow the tractors off-farm or on-farm?
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