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chevy silverado 6L gas mileage

Has anyone used Hypertech and new cat back for better mileage

chevy silverado 6L gas mileage

Postby 2tall [OP] » Aug 31 2012, 6:40pm

Hi Guys
Has anyone used Hypertech and a new cat back system to increase gas mileage on the 6L vortex truck, I am thinking about buying a 2004 - 2007 crew cab, short bed for more power for trailer towing and room for grand kids.
What kind of city mileage and HWY are you getting.
Thanks Ron
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Re: chevy silverado 6L gas mileage

Postby 1500VHO » Sep 16 2012, 6:39am

Hi 2tall,

I have used the Hypertech Max and Corsa dB cat back exhaust system on my 2005 Silverado VHO. I also installed a Volant CAI. I did all of this for performance. Gas mileage was a little better. My usual combination of 80% city and 20% highway, got me about 0.2 - 0.5 mpg improvement.

Not much I know. Where I really saw improvement was with a Diablew tune... You can purchase a InTune or Trinity programmer from him or elsewhere. Either way, getting a tune from Lew got me 2.0mpg more than before. Same type of driving. I just recently got 15.6mpg with my normal city/highway driving. I don't know about all highway driving, just yet. I have not made any long trips recently...

I hope this helped, :D
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Re: chevy silverado 6L gas mileage

Postby gasguzzler6.0 » Sep 18 2012, 12:57am

on my 2500hd i have a k&n fipk, flo pro muffler and a jet 25% reduction underdrive crank pulley and while it did have a noticable difference in performance at WOT, it did NOTHING for inproving my fuel economy. i also bought a superchips flashpaq and that made a big difference in performance on the 87 octane tune but it only increased my mileage about .6 mpg

as far as economy i cant get more than 10.6mpg in the city, and 13.5 hwy.
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Re: chevy silverado 6L gas mileage

Postby TruckRookie » Jun 23 2015, 12:42am

I got a 05 2500HD with the 410 gears and I am only getting a combined 10.3 mpg. I am in need of trying to find the best way to improve my gas mileage.
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Re: chevy silverado 6L gas mileage

Postby zachfletch573 » Jun 26 2015, 1:39am

I have a 2002 6.0L with a superchips, gibson cat back, and an AFE air filter. Also 33 inch tires and 4.10 Gears, I got 14.5 Mpg on the highway and I get about 10-11 mgp in town
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Re: chevy silverado 6L gas mileage

Postby GTX63 » Jun 30 2015, 4:25pm

The 6.0 was built for power and longevity before anything else. If you are pulling trailers, campers, boats, etc, the mileage can't be the priority; muscle and safety should be. That said, my 4.10 geared 6.0 runs about 12mpg unhooked and 14 highway. Towing anything will drop that to about 9mpg. For the money of what a tune may or may not bring, personally I'll keep the cash in my pocket or spend it on the fuel. It isn't my primary driver, it is mainly work and then camping.
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Re: chevy silverado 6L gas mileage

Postby GMman » Jul 15 2015, 2:30am

My 2015 GMC Sierra just turned 4k today, went looking around in the hills, interstate, with ac on and getting 14.5 mpg. Took same trip a few months ago with 1500 z71 with 3.42 gears lc9 engine and gotten 18mpg. Hopefully, when I get 20k in will pick up a little more.
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Re: chevy silverado 6L gas mileage

Postby 06Sam » Jul 15 2015, 2:58am

I have an 06 1500hd with the 6.0. Bolt ons aren't gonna do much more than 1 or 2 mpg better than stock, and you will spend about $1500 for that. You're best bet is a tune, as said before.

Don't get me wrong, I live the 6.0, but like others, I didn't buy it to commute.

Just so you know, a cat back is pointless. The 6.0s have dual 3 inch tubes all the way to the muffler, then 1 tube out. Don't waste money there. Just upgrade the muffler maybe. An intake is a waste on these rigs as well. The only improvement is a sm9ther pipe from the air box to the throttle body, its called a modular intake tube. Made by air raid. You can get into cams and forced induction, but that gets extremely expensive fast. Depending on tunes and stuff though, it may improve mpg marginally.

Depending on how often you will tow and how often you will use the truck, it may be worth looking into a diesel too.


Long story short, spend about $500 on an intune and get a custom tune done if you really wanna spend money on it. Otherwise, put it towards a gas fund and keep your foot out of it.
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Re: chevy silverado 6L gas mileage

Postby Shoe3669 » Jul 17 2015, 4:16pm

I have a 2015 Silverado 6.0, 4x4 double cab. I average 14.5 all miles, 70/30 highway/city. I typically run about 75 on the highway. No modifications of any kind.
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