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01-08-2007, 02:38 PM | #1 |
402 BIG BLOCK
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Gas mileage on a 5.3
What is the average gas mileage that you guys get with your 5.3? In town and interstate. I have a 97 chevy truck now and might get a newer truck if it get a lot gas mileage. With the 97 I get 12 in town and 16 on the interstate. Also if you've had any mileage improvement over stock, and what did you add? Thanks
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala Last edited by bcj67chevy; 01-08-2007 at 02:40 PM. |
01-08-2007, 03:19 PM | #2 |
67 is sold
Join Date: Apr 2001
Location: Troy, Michigan
Posts: 6,738
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Re: Gas mileage on a 5.3
I have a 2000 5.3l 4x4 Sierra Ext Cab
I average about 16MPG mixed highway and city driving with a pretty heavy foot I also have a flowmaster exhaust, K&N open element filter setup and a custom tuned PCM. My MPG is about the same as it was with the stock PCM and the exhaust/intake mods. |
01-08-2007, 03:31 PM | #3 |
Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: Gas mileage on a 5.3
16-18 on the 2005 Tahoe... If the new trucks had the displacement on demand then you would get a little better on the highway....
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01-08-2007, 04:07 PM | #4 |
Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
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Re: Gas mileage on a 5.3
My 2000 ext cab 4x4 with 5.3 stock gets 18-19 highway 75mph max. Around town get 15-16. Towing my 18ft 1500lb flat bed empty gives 16mpg and with a full load trailer--12mpg.
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01-11-2007, 11:31 AM | #5 |
Hittin E-Z Street on Mud Tires
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Gas mileage on a 5.3
Basically exact same truck, I get the same #'s consistently.
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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! |
01-11-2007, 01:42 PM | #6 |
402 BIG BLOCK
Join Date: Mar 2006
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Re: Gas mileage on a 5.3
gotta love the supercharger.
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala |
01-08-2007, 05:15 PM | #7 |
Are fishermen all liars?
Join Date: Oct 2006
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Re: Gas mileage on a 5.3
Mine gets around 14-15 around town. I haven't clocked it on a trip but better than my old truck.
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2004 Z71 Tahoe |
01-08-2007, 09:38 PM | #8 |
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Re: Gas mileage on a 5.3
Hello, just bought a 06 silverado,5.3 ext cab,lt with all creature features,18.2 around town.no long trips yet. Bobby
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01-09-2007, 12:30 AM | #9 |
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Location: Sevierville/Cookeville TN
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Re: Gas mileage on a 5.3
Hey guys i'm new here just thought i would chime in, my 5.3 gets 17-18 around town as good as 20-21 highway, but I also drive like grandpa. The only engine mods are a 40 series flowmaster and an AEM brute force air intake.
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01-09-2007, 10:29 AM | #10 |
402 BIG BLOCK
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Re: Gas mileage on a 5.3
dailydragger03 i take it yours is 2wd. thanks guys
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1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala |
01-09-2007, 05:48 PM | #11 |
Gone Fishing
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Location: Fort Worth, Texas 76135
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Re: Gas mileage on a 5.3
I average about 16 in the CC in town. I haven';t really had much of a trip in it yet
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01-10-2007, 05:08 PM | #12 |
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Join Date: Jan 2007
Location: Sevierville/Cookeville TN
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Re: Gas mileage on a 5.3
Yeah bcj67chevy its bagged on 20's. I use chevron techron fuel system cleaner at every oil change and my gas mileage has never dropped. The truck has 69k miles on it.
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01-11-2007, 11:26 AM | #13 |
Next project: 1970 K10
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Re: Gas mileage on a 5.3
My 03 Silverado extended cab SWB 4x2 was getting 18-19 on average. It went down when pulling my 5000# RV trailer though. Even when I had the Whipple supercharger on it, it still got about the same, except for when my foot got heavy. Blowing the doors off of the little souped up ricers was a hoot!
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01-11-2007, 11:48 PM | #14 |
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Re: Gas mileage on a 5.3
mine gets between 14 and 16 city (i drive it like a transam) and 22 highway with the a/c off.
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01-17-2007, 07:05 AM | #15 |
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Re: Gas mileage on a 5.3
On my 99 Z71 EC/SB w/ the 265 tires and 3.73 gears I'm around 13 in town and 15-16 on the highway (70-75) during the warm months. I lose 1-2mpg in both situations.
My truck has almost 118,000 on it, new plugs/wires at 100,000. I replaced the fuel filter when I bought it, around 80-85,000, might be time for a new one. Anyway, I haven't seen any increase or decrease w/ the new plugs/wires, and I put a new cat back (magnaflow) on it about 2 weeks ago and that didn't seem to do anything mileage wise, but it is winter. I'm jealous of these guys reporting 18/19 w/ virtually the same truck, just newer, I drive my truck w/ a light food and don't think I could get that mileage driving 55 all highway.
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