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Old February 11th, 2008, 12:20 PM   #1
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Default EPA from 5.3L vs 6.0L

Anyone have any real life experience with the vortec 5.3L vs 6.0L gas milage? I never go by what GM says.

They say 2mpg diff.

For a Chevy Avalanche...or other truck
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Old February 11th, 2008, 12:27 PM   #2
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you looking for highway, city, or mixed average mileage?
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Old February 11th, 2008, 12:30 PM   #3
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I have a '05 2500HD w/6.0L and it gets 11.5-12 mpg. Doesn't matter where I drive, city or highway I get 11.5-12.
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Old February 11th, 2008, 12:31 PM   #4
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I have a 5.3 avalanche 03 and on long hwy trips get no more than 17.1 per gallon
round town it usually around 13.5-14.5 depending how I drive. flat towing my yj behind it I get 14.5 hwy
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Old February 11th, 2008, 12:32 PM   #5
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my mom has a 02 silverado 5.3 4x4 auto, and mixed mileage with her driving is 18. with me it's like 16.5 cuz i have a heavy foot.
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Old February 11th, 2008, 12:32 PM   #6
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hosejockey will probably confirm the 11-12 number.

My 99 5.3 got a consistant 16-17 mixed. 18 on the highway with cruise at 70 mph.

Current 07 5.3 is getting a consistant 15-16 mixed. I am hoping for a increase when it warms up.

I have seen as high as 18-19 on highway trips, but the city really kills this truck.

I drive like a sally.
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Old February 11th, 2008, 12:37 PM   #7
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Towing I get 10mpg.
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Old February 11th, 2008, 12:38 PM   #8
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forced induction would jump MPG numbers quite a bit. but few people wanna spend 3000 for a supercharger...lol...buddy of mine back in jersey has a silverado SS with a vortech supercharger on it. went from 14 mpg up to 20 with his heavy right foot...not to mention the extra 100 horses
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Old February 11th, 2008, 12:45 PM   #9
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That 11-12 mpg sound in line with a club member who used to tow with a 2500 6.0, Brad.

But that was several years back, not sure how the latest ones are. Honestly, I knew people who had better mileage with the 8.1. I don't think you can get that in the avalanche any more, tho...(guy at work used to have a 8.1L 2500 avalanche, it was sweet..)
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Old February 11th, 2008, 12:49 PM   #10
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Quote:
Originally Posted by Kodiak450r View Post
forced induction would jump MPG numbers quite a bit. but few people wanna spend 3000 for a supercharger...lol...buddy of mine back in jersey has a silverado SS with a vortech supercharger on it. went from 14 mpg up to 20 with his heavy right foot...not to mention the extra 100 horses
coming from zero experience with superchargers, and parasitic losses, but I'm assuming the extra torque, at lower rpm's and the driver tending to get off the throttle earlier, and/or to avoid wheel spin is the subjective reason for the reported better gas mileage?

A:F ratio's still need to be maintained within a reasonable spectrum so simply cramming more air into the combustion chamber without adding more fuel isn't the gas mileage panacea.

mpg's went down significantly on the couple of cars that I helped mess with that were formerly N.A. and went Turbo. Larger fuel pumps, and injectors as well as perhaps a tendency to play with the skinny pedal.
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Old February 11th, 2008, 01:29 PM   #11
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I'm planning on ordering my new avalance tonight and trying to decide if the increase in power will be worth the diff in MPG
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Old February 11th, 2008, 01:51 PM   #12
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Quote:
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forced induction would jump MPG numbers quite a bit.

you pulled that statement out of your ass.

ryebread set you straight.

The ONLY way forced induction will get you better mileage is if you stay out of the boost, keep your RPM's really low and recalibrate your shift points/torque converter lockup for the added torque down low.

your buddy probably thought he was getting better mileage because the engine was running super lean because nobody recalibrated the air/fuel tables.... a lean mixture makes more power but it also puts holes in pistons and overheats the engine.


a 5.3 will get better mileage than a 6.0L. Ideally you want a 6 speed auto to keep the rpm's low while accelerating, AFM/DOD/whatever you want to cal the 4 cylinder mode will help some too, not towing though.

a 6.2L with VVT/AFM and the 6 speed auto is pretty much the best all around drivetrain right now. $.02
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Old February 11th, 2008, 01:56 PM   #13
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a 6.2L with VVT/AFM and the 6 speed auto is pretty much the best all around drivetrain right now. $.02
Too bad it costs more than your $0.02 for that option
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Old February 11th, 2008, 02:01 PM   #14
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Too bad it costs more than your $0.02 for that option


I didn't hear anyone mention money as a concern did you?
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Old February 11th, 2008, 02:45 PM   #15
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Quote:
Originally Posted by Haggar View Post
That 11-12 mpg sound in line with a club member who used to tow with a 2500 6.0, Brad.

But that was several years back, not sure how the latest ones are. Honestly, I knew people who had better mileage with the 8.1. I don't think you can get that in the avalanche any more, tho...(guy at work used to have a 8.1L 2500 avalanche, it was sweet..)
New ones in the '07 up body style are a tad bit better not towing, about the same towing.

edit i was talking about new 6.0 compared to old 6.0

Last edited by Roadhouse; February 11th, 2008 at 02:51 PM.
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Old February 11th, 2008, 03:38 PM   #16
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Originally Posted by 95geo View Post


a 5.3 will get better mileage than a 6.0L. Ideally you want a 6 speed auto to keep the rpm's low while accelerating, AFM/DOD/whatever you want to cal the 4 cylinder mode will help some too, not towing though.
No it won't, thats a pure gimmick/marketing ploy.

My 99 with out that crap did better then the 2007 with.
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Old February 11th, 2008, 03:40 PM   #17
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Quote:
Originally Posted by RyeBread View Post
coming from zero experience with superchargers, and parasitic losses, but I'm assuming the extra torque, at lower rpm's and the driver tending to get off the throttle earlier, and/or to avoid wheel spin is the subjective reason for the reported better gas mileage?

A:F ratio's still need to be maintained within a reasonable spectrum so simply cramming more air into the combustion chamber without adding more fuel isn't the gas mileage panacea.

mpg's went down significantly on the couple of cars that I helped mess with that were formerly N.A. and went Turbo. Larger fuel pumps, and injectors as well as perhaps a tendency to play with the skinny pedal.
well he got the complete kit from vortech, so it came with everything. had it tuned at the local speed shop in jersey. he also added headers and back exhaust so it breathed real free. he said light throttle driving around he was getting 20 mpg, got up to speed real quick so yes he didn't have to lay into it as hard to get moving unlike when it was stock. when he had it tuned it was laying down 415 horses and 440 ft lbs to the wheels. A/F ratio was steady at 12:1 wot and consistent 14.7 idle and part throttle. this isn't the only instance i know of people getting better MPG from forced induction either. kid i went to school with had a turbo civic. driving normal before the turbo got him 35 mpg. after the turbo he gained 3 mpg same conditions. even laying into the gas he still got 24 mpg. jealous of the 4 bangers...lol especially when the little 1.8 made 260 to the front wheels on our schools dyno.
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Old February 11th, 2008, 06:48 PM   #18
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Back to the question, yes I have owned 3 that fit your question. All bought brand new and driven to 80-90K except for my 07 that has about 25K on it right now

2000 silverado extended 4x4 with 5.3 and 3.73 gears

15-17 highway, 13-15 city lifetime 15
Towing jeep on trailer 8-9 but lacked power and hunted in and out of OD

2004 silverado crew cab 4x4 with 6.0 and 4.10 gears

12-13 highway, 10-12 city lifetime 12
Towing jeep on trailer 8-9 towed great

2007 silverado extended 4x4 with 6.0 Vortec Max (DOD) and 4.10 gears

15-17 highway, 13-15 city lifetime 15
Towing jeep on trailer 8-9

This one is excellent. Great power, and gets pretty good mileage.
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Old February 11th, 2008, 06:51 PM   #19
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Originally Posted by whiterhino View Post



2007 silverado extended 4x4 with 6.0 Vortec Max (DOD) and 4.10 gears

15-17 highway, 13-15 city lifetime 15
Towing jeep on trailer 8-9

Jim funny thing those are the same mileage that a guy I work with is getting with his '07 2500hd. Difference is he has plain 6.0L no max and has the new 6spd auto, and 3.73 gears.

He mentioned gettting better mileage towing with his previous 2500hd 6.0L and 4.10 gears.
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Old February 11th, 2008, 07:08 PM   #20
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The other difference is that his rides a lot rougher than my half ton. I would guarantee you I could get another 2mpg highway if I drove a little more conservative. I also bet mine has a lot more acceleration. the max is 365 hp and it scoots pretty good.
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