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6.7 Fuel MPG

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Regen and Mileage

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I just picked up the new issue of Diesel Power, it had article on the new 6. 7 C/C.

It averaged 10. 56 mpg on 3 three tanks of fuel. (9. 95, 11. 92, 9. 81 mpg) Not too impressive! I hope this is not sign of the way things are going to be.

Expensive fuel, expensive trucks with expensive diesel options and fuel economy about on par with a gasser does not equal a lot of truck sales. IMO
 
I've noticed that magazine reviews such as that always seem really low for some reason or another. Admittedly, those #'s are low, but EB's truck seems to be getting pretty good mileage? Of course, Gen III's mileage don't equal 12 V's, so why should we expect the 6. 7 to, other than the possiblity that the 6 speed autos will be equalizers with respect to mileage?
 
Consumer Reports also said the Jeep Liberty CRD's were getting 12--14 mpg at one time, too. :-laf My CRD has never gotten less than 22. 6 mpg on winter blend with some idling. :-laf



I have much more faith in EB's real-world numbers than Diesel Power's short-term testing.



Greg
 
I'm averaging a little over 10 mpg (10. 1-10. 2) pulling my trailer. Were those mileage figures on the truck alone? The one time I made a run without the trailer long enough to check the mileage it was around 15 mpg. This was all non stop interstate driving. I really think the 6. 7 mileage is going to be close to if not better than the 5. 9 when you compare apples to apples. A 6. 7 with a 6 speed stick and 3. 73 gears should make better mileage than I get with 4. 11 gears and the Aisin auto.



I should have the engine broke-in by the end of Feb. It might do a little better on mileage then. I'm going to go one more oil change then switch over to synthetics.
 
gsbrockman said:
Consumer Reports also said the Jeep Liberty CRD's were getting 12--14 mpg at one time, too. :-laf My CRD has never gotten less than 22. 6 mpg on winter blend with some idling. :-laf



Greg



First off Consumer reports hates diesels, plus the don't know how to drive them. When they were doing the TDI on TV I was amazed they keep reving it like a little 4 banger gasser. no wonder they were getting bad MPG. We all know you don't drive a diesel like a gas engine, no need to rev to the red line every time you shift.
 
EB said:
I'm averaging a little over 10 mpg (10. 1-10. 2) pulling my trailer. Were those mileage figures on the truck alone? The one time I made a run without the trailer long enough to check the mileage it was around 15 mpg. This was all non stop interstate driving. I really think the 6. 7 mileage is going to be close to if not better than the 5. 9 when you compare apples to apples. A 6. 7 with a 6 speed stick and 3. 73 gears should make better mileage than I get with 4. 11 gears and the Aisin auto.



I should have the engine broke-in by the end of Feb. It might do a little better on mileage then. I'm going to go one more oil change then switch over to synthetics.





Hi EB

I,m going to find out right away (when I pick up the new truck) what the MPG is on the exact truck you Quoted, G56 3:73. I have to drive 1500 miles W/O the service bed to the eastern side of Kansas from SO. CAL to pick up my Elite Service bed being built as we speak, and then drive back with the full weight on the truck from the the new bed. Although the MPG should be better due to breakin speeds from the first 500 miles it should be a great comparison of before and after and to top that, I will have to outfit all tools, ladders, equipment and stock that will add a lot of weight to the truck after the 3000 mile trip for the equipped MPG.

I will weigh C&C before bed, after bed and after outfitting the truck. I plan to post the trip to include a tour of the plant of the manufacture of the Elite bed (B&W). The truck wont be finished until the end of March so you have to wait like I have too for the info.

P. S. It will be the longest 2 mo. of my life
 
6.7 Mpg

KSHall said:
I just picked up the new issue of Diesel Power, it had article on the new 6. 7 C/C.

It averaged 10. 56 mpg on 3 three tanks of fuel. (9. 95, 11. 92, 9. 81 mpg) Not too impressive! I hope this is not sign of the way things are going to be.

Expensive fuel, expensive trucks with expensive diesel options and fuel economy about on par with a gasser does not equal a lot of truck sales. IMO



I just went on a 1200 mile trip with my new 3500 C&C and averaged 13. 2 mpg. The truck only has 1325 mi. on it. I have 3:73 w/ 6 spd manual trans. . I'm very happy with mpg as my '99 W/4:10 & 5 spd only averaged 11-12 mpg with the same body on it. My truck weighs approx. 9400 with body, tools ect. on it. I'm leaving tomorrow for Ohio and will be towing a trailer this time. I can't wait to see how it does. I know the exhaust brake will work great with a load.



Jim

'99 3500 C&C (for sale)

'05 2500 QC 4x4 SLT

'07 3500 C&C 4x4 SLT
 
A 6. 7 with a 6 speed stick and 3. 73 gears should make better mileage than I get with 4. 11 gears and the Aisin auto. QUOTE]



True, but only because of it being a manual transmission. The G56 gearing makes a 3. 73 act like a 4. 10. :-laf

#@$%! (if you're not towing)
 
Hi EB

I,m going to find out right away (when I pick up the new truck) what the MPG is on the exact truck you Quoted, G56 3:73. I have to drive 1500 miles W/O the service bed to the eastern side of Kansas from SO. CAL to pick up my Elite Service bed being built as we speak, and then drive back with the full weight on the truck from the the new bed. Although the MPG should be better due to breakin speeds from the first 500 miles it should be a great comparison of before and after and to top that, I will have to outfit all tools, ladders, equipment and stock that will add a lot of weight to the truck after the 3000 mile trip for the equipped MPG.

I will weigh C&C before bed, after bed and after outfitting the truck. I plan to post the trip to include a tour of the plant of the manufacture of the Elite bed (B&W). The truck wont be finished until the end of March so you have to wait like I have too for the info.

P. S. It will be the longest 2 mo. of my life



Enjoy Humboldt...
 
M.P.G, 6.7 CTD, Fiberglass Camper Shell, Unloaded.

From Albuquerque NM, to Amarillo TX, on Hwy 40, about 600 miles, my number was 19. 1 mpg. Overall milage from Dishman Dodge, Spokane WA, Oragon, Idaho, Nevada, California, Algdonas Mexico, Yuma Arizona, New Mexaco, and home in North Texas was 17. 6 mpg.
 
Mel, those are great numbers. I was able to get mine to 18. 2 for a stretch on PCH, but that was driving 50 - 55 mph, with no stops. As soon as i got into town, the number dropped down to 15. 5 (this is all on the overhead computer). My first tank averaged out to 14. 6. Sounds like a great drive!!!!
 
Stutter

I just picked up the new issue of Diesel Power, it had article on the new 6. 7 C/C.

It averaged 10. 56 mpg on 3 three tanks of fuel. (9. 95, 11. 92, 9. 81 mpg) Not too impressive! I hope this is not sign of the way things are going to be.

Expensive fuel, expensive trucks with expensive diesel options and fuel economy about on par with a gasser does not equal a lot of truck sales. IMO



Interesting event yesterday. Went to South Lake which is about two thirds highway and a third lights, stop and go. On the way across Hwy 114, the check engine light came on and the engine developed a slight stutter when bogged down at low RPM’s. Acted like a fuel starvation response. All gauges were on the money. Pulled over and shut her down. Started up, no check engine light, went on my way. The round trip was 127 miles and my fuel MPG took a big DROP all the way down to 16. 1 mpg. Not sure what to make of the situation. May have to plan a little trip to see if the MPG will get back up to what I had come to expect.

mrs
 
Dunno about the 6. 7 C/C, but my initial fuel usage tracking has been a little more encouraging with my brand new 3500 SLT quad cab, 4x4, 6. 7 68RFE.

I drove my '97 to Glenwood Springs, unloaded all my stuff (a ton's worth of power tools and parts bins) into the back of my new 3500, and headed up to Aspen to check on one of my crews. The trip to Aspen (about 55 miles from the dealership) was into a headwind, and included 22 stop lights, (I managed to hit about half cycling to red).

I put the cruise control on 60 mph, and just let the truck be pushed side-to-side by the strong winds. Aspen lies at an elevation of 8000 ft, and Glenwood Springs is at 5700 ft, so the trip from the dealership was uphill all the way. I watched the overhead console, and the truck managed 14. 3 mpg average over the trip up the long grade.

The return trip to El Jebel and home is about 25 miles, and is downhill all the way, so, naturally, the truck glided most of the way, except for the last two miles which is a steep, uphill grade (1000 feet in about . 6 mile), and the average -- including the return trip home -- brought the fuel-use number up to exactly 17 mpg at the El Jebel turn-off, which is half-way back to Glenwood Springs.

The steep ascent up the mountain to our house overlooking the valley knocked the average down to 16. 5, but I was still pretty impressed by this first 85 mile trial.

I figure that if I'd let the truck coast the rest of the way back to Glenwood, the fuel usage would've been mid to high 17s, which I think is pretty awesome for a new, heavy truck with a very-tight drive train, and on a very windy day. Also, we're still burning "winter fuel" in this area; it still drops down in the low twenties at night, so I'm sure the summer fuel story will offer more encouragement still.

I don't know how accurate these computers are --- could be off, significantly, but I'm pretty sure that this drive-train (engine/transmission combo) will produce significantly better results than those indicated by "Diesel Power".

Personally, I'd be tickled to death to see an average of 16-17 mpg (loaded) on this big rig, and, after she's fully broken in, I think that's a reasonable expectation.
 
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Pete,

I don't know which differential I have, I'm embarrassed to say. I've towed for years with the 3. 54 gears, and never wanted to go with the heavier gearing. I have the anti-spin differential, but don't know what the gearing is. I'll say this: After towing my trailer this afternoon, it doesn't feel particularly punchy coming out of the hole, so l'd guess that I have the 3:73s.

It's not indicated in any of my paperwork, and it's not on the door column, the underside of the hood, or back on the diff, itself.

I guess I can call the dealer, tomorrow, and have him run the VIN for me to find out...
 
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