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  1. #1

    Default 05' Silverado 6.0 MPG

    So ive had this truck about 2 weeks and have taken it on one 700 mile road trip and daily to work. My best estimation has it at 12 mpg city and about 14.5-15.0 highway using 93 octane fuel. It has a k&n cai and outside of a tuneup (which im not sure that it needs) I would love to hear some ideas as to how to improve my gas mileage. I have thought of a custom 87 octane econo tune but I wanted to take it to the experts here first.
    Thanks in advance

  2. #2
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    Welcome to the club!

    I have never heard of anyone running a 6.0 on 93 octane unless it was supercharger or had a turbo, that seems like a waste of money to me. Even if the truck was untuned and stock, that 6.0 isn't know for it's gas mileage it's know for it's get up and go!
    2004 Chevy Colorado
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  3. #3

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    Quote Originally Posted by TRPLXL2 View Post
    Welcome to the club!

    I have never heard of anyone running a 6.0 on 93 octane unless it was supercharger or had a turbo, that seems like a waste of money to me. Even if the truck was untuned and stock, that 6.0 isn't know for it's gas mileage it's know for it's get up and go!

    Its not uncommon to run premium fuel in any gasoline internal combustion engine anywhere in the world that it is available. As crazy as it sounds it does happen. My post was to gain insight as to how I might improve my gas mileage.

  4. #4
    Master Mechanic TritonBoulder47's Avatar
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    First off, your attitude needs to be adjusted... The modern engine is made to run the best using 87 octaine fuel, and in alot of cases you'll get worse fuel economy with higher octaine fuels. As TRPLXL2 said, your 6.0L is a gas hog, that engine is build for power and torque, not fuel economy...

    But back to your inquiry...

    Basically your engine is a sophisticated air pump... The faster and easier you can get the air in and out, the more efficient it will perform.

    Since you alreay stated that you have an intake, I'd suggest an exhaust system. A cat-back will give you some gains, but to get the full advantage you should get a complete system: headers, high flow cats, high flow muffler.

    After that, I would do a complete tune-up. Plugs, wires, clean your air filter, clean/replace your fuel filter, clean your mass air-flow sensor, clean your throttle body, and run a bottle of injector cleaner through it. This will insure that your complete system is at its cleanest.

    After that, a programmer or a custom tune will help some more. With a programmer and/or custom tune, 93 octaine will yeald the best results...

    Plus you have to take in to account other things like your tire size (if you've gone larger then stock), and your gear ratio.

    Hope this helps...

    Tim a.k.a. Da' Boulder

    2003 Chevrolet Avalanche Z71 - Custom Emergency Response POV

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  5. #5
    Legend unplugged's Avatar
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    Thumbs up Glorified Air Pump

    The last time I checked, my burb gets 10-12mpg. I've never tried to improve it. I don't use it to commute to work in. Thankfully I have a company vehicle for that. I do agree with the whole air-pump thing. Improvements to the intake/exhaust are always of benefit, but at what cost? Other than running tires at high pressures, using synthetic lubricants and using some hypermiler driving techniques I don't think that there are any low cost mods that offer real advantage.

    If you are running a open bed, consider getting one of those nets to replace the tailgate. Mythbusters did a test and it offers a 5% improvement over an open bed, regardless of the tailgates up vs down.
    [ame="http://www.youtube.com/watch?v=r3aqHbD-O9E"]YouTube- Insert from MythBusters - Tailgate Up or Down 2 (from More Myths Revisited) fuel consumption test[/ame]
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  6. #6
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    Using the higher octane is gonna crap up the engine, higher octane needs higher compression and more heat so if it doesnt get that you arent getting a good burn in the cylinder and are essentially running rich, you probably cant see it but when you stomp the truck you probably get a puff of black smoke out the tailpipe. So Do the tune-up and get off the high octane, it does NOTHING, By the way my dad pulls 20mpg on his 6.0 on his 07
    99 K1500 Suburban LT "THE BEAST"
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    Legend s5belford's Avatar
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    Tonneau covers "say" they will increase your mileage but I haven't seen much/if any change, but other than what everyone else has said that's my only suggestion.

    My mileage on my 5.3 is usually around 17-18 on the highway and 12-ish city which sucks but I drive 3 miles to campus with 8 stop lights on the way so its tough... plus my foot gets a little heavy when I'm stuck driving around dumb people


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  8. #8
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    Default

    Actually tonneau covers are more likely to do nothing or reduce, trucks are designed with the airflow through the bed for a purpose not because the designers/manufacturers are cheap and wont just give you one. I know this because i took a couple basic auto engineering classes in college.
    99 K1500 Suburban LT "THE BEAST"
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