MPG and Opinions on the 6.7? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 07-04-2009, 01:58 AM Thread Starter
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MPG and Opinions on the 6.7?

Hey guys. Well, due to smog laws looming over head, I've been thinking of trading my 24v in on a 6.7L. I love my 24v but the twins and sticks, and cam and goodies won't pass smog, and if I get it smogged then throw the mods back on and get caught, its a hefty ticket that I don't want to worry about.

So, my first impressions driving the 6.7 are that I like it. It seems like a nice truck. What problems are you guys having with them and how do you like them. Also what kind of mileage do you see out of them when left stock? If I buy one it will be a quadcab, long box, manual, 4x4 with 3.73's. If I keep it at around 60-65 what kind of mileage can I expect unloaded on the freeway? and what about towing around 10-12k?
Sean

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post #2 of 12 (permalink) Old 07-04-2009, 02:37 AM
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All the reasons your looking to get one is all the problems the 6.7 has had. Emissions related problems. It has got better though. As far as milage you could get a real wide range of answers. I got about 14 stock unloaded, and around 9 pulling that kind of wieght stock. I'm not stock anymore. lol I do have a buddy with a 09 that is stock and he's getting 17-18 unloaded, and around 11 loaded. He says it runs great, and he ain't touching it. He pulls a lot of the time though.

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post #3 of 12 (permalink) Old 07-04-2009, 04:59 AM Thread Starter
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My other big concern is with the DPF, since my family is in the cattle business the truck does spend a fair amount of time off the road and in and around tall dry grass. The last thing I want is a truck that is going to start a fire. I'm sure DPF deletes will be highly illegal if/when these smog laws pass. Is there any other way to keep the DPF from activating to burn out particulates? I don't mind it coming on on the road or on pavement, but in the grass seems very risky.

Thanks for the input. I may just end up buying a 12v and building it.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

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post #4 of 12 (permalink) Old 07-04-2009, 06:24 AM
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i have had mine in the hay field before when it was bone stock no grass fries to date from me. I know ATS is coming out with a aftermarket dpf pipe and they are suppose to lower the outside temps of the pipe quite abit from what i read so thats one option you could have in the future and that wont void your warranty cause they are doing to try to keep people to keep their dpf on and not remove it. i say go for it and get one glad i did. Few of the 07 and 08 had some turbo and dpf problems but i think got all tose kinks worked out new design cant expect perfection in one year.

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post #5 of 12 (permalink) Old 07-04-2009, 08:12 PM
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Quote:
Originally Posted by sstockton View Post
Hey guys. Well, due to smog laws looming over head, I've been thinking of trading my 24v in on a 6.7L. I love my 24v but the twins and sticks, and cam and goodies won't pass smog, and if I get it smogged then throw the mods back on and get caught, its a hefty ticket that I don't want to worry about.

So, my first impressions driving the 6.7 are that I like it. It seems like a nice truck. What problems are you guys having with them and how do you like them. Also what kind of mileage do you see out of them when left stock? If I buy one it will be a quadcab, long box, manual, 4x4 with 3.73's. If I keep it at around 60-65 what kind of mileage can I expect unloaded on the freeway? and what about towing around 10-12k?
Sean
I have 55,000 miles on my 07. Other then a water pump leak(see "My first problem" thread) I have been completly trouble free. I have made 19+ mpg a number of times, on freeway driving completly empty @ 70-75mph. Normal every day driving with tool box etc on the farm which is closer to city driving with county roads mixed in I get 14.5-15mpg. IMO the secret to minimizing plugged dpf (which I have never seen) is to drive it with a heavy foot and minimize the idling.
Hope this helps you.

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post #6 of 12 (permalink) Old 07-04-2009, 08:36 PM
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I agree with u guys I love my truck and wouldn't trade it for anything, the biggest issue behind the dpf probes and then later on injectors is high idling time keep from doing that and u should be fine.

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post #7 of 12 (permalink) Old 07-05-2009, 10:59 PM Thread Starter
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Yeah, I don't often do a lot of extensive idling. Just get to where I'm going, idle down and shut off. If the dealer can get the numbers where I want them, it looks like my brother and I will both be buying one this week. And with the way the smog laws are written, I may end up getting to keep my 24v the way it sits for a while. Maybe have 2 trucks.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

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post #8 of 12 (permalink) Old 07-06-2009, 08:33 PM
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I have an 07.5 2500 Quad Cab 2wd and just made a camping trip to San Antonio, Tx. Mainly flat ground with some slight hills. Round tirp was just under a 1000 miles and I got 11.5 mpg with speeds between 65-70. Camper weights approx. 8500 lbs. My truck is totally stocked. So far no complaints. Empty driving back and forth to work (approx. 80 miles round trip) with speeds between 60-70, I get between 20 to 21 mpg.

Hopes this helps.
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post #9 of 12 (permalink) Old 07-06-2009, 11:01 PM
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post #10 of 12 (permalink) Old 07-07-2009, 11:52 AM
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Best I have gotten running empty on the hiway was 17.0. This past weekend I installed a Superchip Cortex program. I put in the XS Economy program. and got 20.2 mpg on the hiway. Performance is better than stock and it says I can pull/tow maximum load in this setting. The next towing weekend I will use the Economy/mode, then the Tow/mode and do a comparison to see which one gets the best mileage under a load. I will let ya'll know how it turns out.
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