fuel mileage with an LS1 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CMFK72 · 04-15-2012, 03:53 AM

anybody out there running an LS1 or know someone who's running an LS1 and have an idea as to what kind of fuel mileage to expect? my plans are to drop one in. found a donor car w/a 6sp trans.

y5mgisi · 04-15-2012, 04:52 AM

Stock truck with a stock ls1, light foot, 13-15 in town, 17-20 highway. Less if more then stock truck, more then stock ls1, more then light foot.

CMFK72 · 04-15-2012, 05:11 PM

thanks man, ive found a donor 2000 camaro with a 6sp. the owner says out on the interstate he has gotten as well as 30mpg at around 70mph. ive actually witnessed this to be true with another friend who used to have one. it seems to be because of how low the rpm's are in 6th. i guess our aerodynamics arent good enough to get close to that??

GASoline71 · 04-15-2012, 09:44 PM

Put it in a truck, and it's a whole new ball game. Trucks are as aerodynamic as a barn door, and they are heavier.

Gary

BHyatt · 04-16-2012, 12:39 AM

Maybe around 700 lbs. on the weight. The Camaro weighs in at around 3300 lbs. My truck with me in it weights in at 4000.

gearys 5600 · 04-16-2012, 12:46 AM

The LS with a T-56 behind it gets 5-6 mpg better on the highway than a LS with a 4L60 or 65.

I would think a 4k pound truck should get 20+ mpg on the highway with the right rear gear.

I have owned several LS powered camaros,firebirds & corvettes and the T-56 kills the automatics in MPG.

CMFK72 · 04-18-2012, 06:19 PM

thanks guys, im still working on my truck so i havent driven it enought to know what kind of fuel mileage it will get with the 350 and th350 but im guessing around 10. so i guess i should be happy enough to double the fuel mileage, haha.

trkfrk · 04-18-2012, 08:23 PM

I am installing an LS1 and 6 speed now. I can hopefully answer your question before my son graduates high school in 2020..

CMFK72 · 04-20-2012, 04:21 PM

Quote:

Originally Posted by trkfrk

I am installing an LS1 and 6 speed now. I can hopefully answer your question before my son graduates high school in 2020..

...know the feeling!

Marauder_Pilot · 04-20-2012, 04:46 PM

How involved is an LS-1 swap, anyways?

CMFK72 · 04-20-2012, 04:51 PM

Quote:

Originally Posted by Marauder_Pilot

How involved is an LS-1 swap, anyways?

well from where i am with it, it doesnt seem to be that big of a deal. as long as you have the eng/trans/ecm/wiring harness out of the donor car, you will need to send the ecm to be reprogrammed to work with the truck(about $600), different headers, motor and trans mount adapters, and a lot of patience.

04-15-2012, 03:53 AM	#1
CMFK72 Registered User Join Date: Jan 2012 Location: Jasper, AL Posts: 18	fuel mileage with an LS1 anybody out there running an LS1 or know someone who's running an LS1 and have an idea as to what kind of fuel mileage to expect? my plans are to drop one in. found a donor car w/a 6sp trans.

04-15-2012, 04:52 AM	#2
y5mgisi Second Chance Program Join Date: Jun 2006 Location: Portland, OR Posts: 2,642	Re: fuel mileage with an LS1 Stock truck with a stock ls1, light foot, 13-15 in town, 17-20 highway. Less if more then stock truck, more then stock ls1, more then light foot.

04-15-2012, 05:11 PM	#3
CMFK72 Registered User Join Date: Jan 2012 Location: Jasper, AL Posts: 18	Re: fuel mileage with an LS1 thanks man, ive found a donor 2000 camaro with a 6sp. the owner says out on the interstate he has gotten as well as 30mpg at around 70mph. ive actually witnessed this to be true with another friend who used to have one. it seems to be because of how low the rpm's are in 6th. i guess our aerodynamics arent good enough to get close to that??

04-16-2012, 12:39 AM	#5
BHyatt Registered User Join Date: Jul 2007 Location: New Castle, IN Posts: 199	Re: fuel mileage with an LS1 Maybe around 700 lbs. on the weight. The Camaro weighs in at around 3300 lbs. My truck with me in it weights in at 4000.

04-16-2012, 12:46 AM	#6
gearys 5600 Registered User Join Date: Mar 2010 Location: tulsa,ok Posts: 1,085	Re: fuel mileage with an LS1 The LS with a T-56 behind it gets 5-6 mpg better on the highway than a LS with a 4L60 or 65. I would think a 4k pound truck should get 20+ mpg on the highway with the right rear gear. I have owned several LS powered camaros,firebirds & corvettes and the T-56 kills the automatics in MPG. __________________ MY BUILD THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=423629 1969 custom/10 swb--SOLD 1968 swb 50th anniv.--SOLD 1967 camaro ss/rs..LS-6-speed, 16-year long project 1956 chevy nomad 1955 chevy 210 2-dr sedan 1978 el-camino ss 1-owner

04-18-2012, 06:19 PM	#7
CMFK72 Registered User Join Date: Jan 2012 Location: Jasper, AL Posts: 18	Re: fuel mileage with an LS1 thanks guys, im still working on my truck so i havent driven it enought to know what kind of fuel mileage it will get with the 350 and th350 but im guessing around 10. so i guess i should be happy enough to double the fuel mileage, haha.

04-18-2012, 08:23 PM	#8
trkfrk Registered User Join Date: Jul 2010 Location: Las Vegas, NV Posts: 969	Re: fuel mileage with an LS1 I am installing an LS1 and 6 speed now. I can hopefully answer your question before my son graduates high school in 2020.. __________________ Mark 1972 C10 SWB LS1/T56 6 speed trans/4:56 posi with 5.5"-7" static drop/Boss 338 Wheels 18"x20" My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=424609. My first start up http://youtu.be/R899YQ1OcjU

04-20-2012, 04:46 PM	#10
Marauder_Pilot Registered User Join Date: Apr 2012 Location: Whitehorse, Yukon Posts: 17	Re: fuel mileage with an LS1 How involved is an LS-1 swap, anyways?



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