Fuel Mileage of 2006 8.1 Chevy 2500

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Thread: Fuel Mileage of 2006 8.1 Chevy 2500

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    Fuel Mileage of 2006 8.1 Chevy 2500

    My dad is looking for a used 2500 and found a clean 2006 with the 8.1 V8. Most of the trucks he has seen have the 6.0. He is concerned the 8.1 will really suck the gas more than the 6.0. Can someone give me some idea of the diff in fuel consumption between the two? This isn't a daily driver, but will be used for some towing and general truck stuff.

    Thanks.

    Dave

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    From the people I've talked to they seem to be about the same as the 6.0L. From the short time I spent driving on I would agree. The 6.0L has the 4l80E 4 speed tranny where as the 8.1L comes with the 5 speed allison. So, I think the extra gear helps.

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    6.2 Liter LS9 Supercharged V8 MrCritical's Avatar
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    In other words if you have to ask, better buy the DuraMax.

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    Quote Originally Posted by chevytodd View Post
    From the people I've talked to they seem to be about the same as the 6.0L. From the short time I spent driving on I would agree. The 6.0L has the 4l80E 4 speed tranny where as the 8.1L comes with the 5 speed allison. So, I think the extra gear helps.

    Exactly. That extra gear really gives the 8.1L V8 better FE.
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    What tranny does the 2006 have?
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    Quote Originally Posted by smith7629 View Post
    What tranny does the 2006 have?
    Allison 1000 6 speed.... Mileage probably worse then gutless Ford V10.
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    A few of my snowplow buds have the 8.1.
    Expect LESS than 10 mpg around town !
    My 04 6.0 x-cab 4x4 got 13 city 17 hiway.

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    Did you guys consider a diesel instead of the 8.1?


    Quote Originally Posted by ljtyphoon View Post
    Allison 1000 6 speed.... Mileage probably worse then gutless Ford V10.
    LJ

    LOL the Ford V10 was just awful.
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    I have currently have a 2001 2500HD ECSB 4x4 with an 8.1L/ZF 6 speed manual that I bought new and a 2005 2500HD SCLB 4x4 with a 6.0L/4L80E. I live at high altitude and the mileage difference between the two is hardly noticeable although the 8.1L with the manual often gets better mileage when lugging around town. With stock calibrations the 6.0L is much quicker and more athletic around town while the 8.1L is the tool for the job when a house needs yanked off the foundation. The 8.1L is a much cheaper alternative to diesel power. I also stuffed an 8.1L in a ’78 K10 with 35’ tires and 4:56 gears backed by a NV4500 with a 1500 lb Phoenix pop-up camper on the back that is pulling around 12/13 MPG on the highway when cruising around 65 MPH.
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    The 2-valve 6.8L V10 was not a very powerful engine, but it was reliable. In 2005 Ford went to a 3-valve V10, which was rated at 362hp, and 457lb ft of torque. It was mated to Fords 5-speed TorqShift trans. It is a very good work engine, and is downright quick.

    The engine is very reliable and powerful. It has a cult following in the Ford community, much like the 8.1L has in the GM community. The V10 will get slightly better mileage than the 8.1L. I get 9-10 in town, with winter gas, in my 7500lb beast. With summer gas, it is 10-11.

    There were/are alot of people upset in the Ford community, when Ford switched out to the 6.2L V8 in the SuperDuty. While the engine makes slightly more horsepower, it makes alot less torque.

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    If you ever see 14 mpg with an 8.1 under any circumstances, you'd better call the Guiness Book.

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    Quote Originally Posted by DirtyLarry View Post
    the 8.1L is the tool for the job when a house needs yanked off the foundation.
    AMEN on that! The 8.1 has the B*LLS thats fer sure ........................

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    Quote Originally Posted by Extreme4x4 View Post
    The 2-valve 6.8L V10 was not a very powerful engine, but it was reliable. In 2005 Ford went to a 3-valve V10, which was rated at 362hp, and 457lb ft of torque. It was mated to Fords 5-speed TorqShift trans. It is a very good work engine, and is downright quick.

    The engine is very reliable and powerful. It has a cult following in the Ford community, much like the 8.1L has in the GM community. The V10 will get slightly better mileage than the 8.1L. I get 9-10 in town, with winter gas, in my 7500lb beast. With summer gas, it is 10-11.

    There were/are alot of people upset in the Ford community, when Ford switched out to the 6.2L V8 in the SuperDuty. While the engine makes slightly more horsepower, it makes alot less torque.

    The V10 really doesn't blow the new V8 out of the water when it comes to torque. The V8 makes 434 and the V10 makes 457. I'll bet the V8's torque curve is flatter, and a 6 speed won't hurt either. The V8 will also net better fuel economy.

    Back to main topic, why don't you guys just get a diesel?
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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    To answer your question, alot of people do not want to pay $5000, to the current $8000 for the diesel option. Yes you get better mileage, however, it doesn't pay for the upcharge. Plus, you get to buy higher priced fuel for it.

    Whenever fuel prices really go up, the gasser HD's sell alot better. You would think it would be the opposite based on fuel economy alone. However, it is the cost of ownership that really hurts the diesel. Not just in purchase price and fuel price, but in maintenance costs also.

    This is why we bought our V10 vs the diesel............. and my husband drives big diesel trucks.

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    Re: Fuel Mileage of 2006 8.1 Chevy 2500

    Quote Originally Posted by Envoy4Life View Post
    Back to main topic, why don't you guys just get a diesel?
    From the what can be gathered in the original post I don't think the extra $$ for a Diesel is neccessary. A used late model Diesel can bite you in the @ss on fuel system costs if it wasn't properly maintained. It can cost you over $5K to repair the injection system on a Dmax and other HPCR systems.

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