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Go Back   Dodge Cummins Diesel Forum > 07.5 - 09 6.7 Liter Cummins > 07.5 - 09 3rd Gen 6.7 Liter General Discussion
07.5 - 09 3rd Gen 6.7 Liter General Discussion General Chit Chat About the 6.7L 3rd generation Cummins - NO ADVERTISING

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Old 11-13-2007, 01:24 PM   #1 (permalink)
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6.7 fuel mileage

I'm looking to get a new '08 2500 6.7liter in the spring and wanted to know what people are getting for mpg with this new engine. Also I've seen alot about the new Diesel fuel required for these trucks, will it hurt the vehicle if I continue to run #2 fuel in it (like we could with the 5.9l)?
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Old 11-13-2007, 04:46 PM   #2 (permalink)
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You cannot run LSD in the 6.7. Soon everything will be ULSD anyways.
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Old 11-13-2007, 04:50 PM   #3 (permalink)
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I've been getting around 16.5 MPG which is probably 70% highway, 30% "back" roads. City is pretty bad...around 11 or so.
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Old 11-14-2007, 06:49 AM   #4 (permalink)
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I have 25,000 miles on mine, which was bought in June of 2007. I can't get above 13.5 mpg empty on the highway. My towing mileage with a 10,000 lb camper is only 7.5 mpg.



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Old 11-14-2007, 07:02 AM   #5 (permalink)
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Old 11-14-2007, 08:53 AM   #6 (permalink)
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I have a fairly heavy foot and live in WV so I have nothing but hills on the highway. My driving is around 70% highway and the rest city, I've been getting on average around 15 mpg. A few tanks were close to 17 but that was all highway unloaded. Haven't had the pleasure to have it loaded yet.
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Old 11-14-2007, 09:04 AM   #7 (permalink)
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I have a new 07 6.7 Quad Cab and I just got back from the Walmart after filling up on ULSD. Hand calculated my mileage at 18.3. Previous tank was 18.6. All easy, unloaded miles. The overhead display always shows over 20, so you can't trust it for an honest number.
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Old 11-14-2007, 10:16 PM   #8 (permalink)
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I just test drove a 6.7 68RFE with the 4.10in a 2500 and the best I could squeeza at a steady 70 was 14.3. About 30 minutes earlier drove an 07 5.9 in the same basic truck but 4spd 3.73 and it returned about 22.5 in the same loop. I know the gauge isn't dead accurate but the delta is probably relevant.

I was suprised at how much lower the 6.7 mileage was, despite having the advantage of a 6spd. I guess the ULSD doesn't have the same BTU or something.

So my brief experience seems to be the norm. I've talked to a few 5.9 12v and 24v at the track owners (where I tow to)who talked about 20+ when towing if they could keep their foot out of it. That's 35% better and at least for a while, the fuel might be cheaper.

So as sexy as the 6.7 and 6 speed is, I think the fully debugged '07 5.9 24v with 4 spd might be a better bet.

New to diesels so forgive me if I've got any info way wrong.
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Old 11-15-2007, 11:16 AM   #9 (permalink)
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if the overhead was only stating 14.3 at 70mph, then it was probably doing a regen. Especially since it was a truck that probably has been test drove a lot and started for customers and it just sat there running so the customer could hear it.

If i get on the highway and reset my overhead, it will average via overhead around 20mpg. Really i dont think MPG is all that bad for most, but some ppl sure are getting some horrible mileage, no doubt about it. My average is btwn 16-17 Hand calcd. For about 60% hwy and 40% city.
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Old 11-15-2007, 04:12 PM   #10 (permalink)
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I just did another calculation for my new truck's fuel economy. Last tank averaged to 18.1L/100kms or 12.99mpg (US) or 15.61 mpg (Imperial). Not very good fuel economy...especially since I am not hauling huge loads. I hope that it gets better as it breaks in more. I am not impressed with the emission system on my new truck. I am sure that it is corking up the engine in a bad way.
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Old 11-15-2007, 04:15 PM   #11 (permalink)
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Quote:
Originally Posted by fontainr View Post
I'm looking to get a new '08 2500 6.7liter in the spring and wanted to know what people are getting for mpg with this new engine. Also I've seen alot about the new Diesel fuel required for these trucks, will it hurt the vehicle if I continue to run #2 fuel in it (like we could with the 5.9l)?
If you can still get the old fuel, buy a big container and buy as much as you still can and find a used 07 or 06 5.9
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Old 11-15-2007, 11:26 PM   #12 (permalink)
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Just drove my 08 on a 800 mile round trip haulin arse the whole way and hand calc I got 18 + mpg not bad truck has 6000 miles
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