mileage

[jimnance]

Just got back from a 400 mile trip pulling my fifth wheel. Iam am a little disappointed with my mileage and speed up the hills.



I have an edge EZ, with a 4" straight through exhaust. 3. 54 auto trans in my 99 4X4 Q. C.



Averaged 10. 2 MPG all highway. About 1/2 of the trip was up and down small hills and about 5% was several fairly steep grades.



Couldn't pull the steep grades in fourth, had to wind up in third and still was only doing 35-40 MPH up the hills. 30 PSI of boost, and EGT was 1100 degrees F.



My Gross weight of trailer and truck was 19,900 lbs.



Does this sound about right?

 

[pwr2tow]

Depends on the size of the hills but that is very close to my numbers.

Ron

 

[pwr2tow]

I should mention that my figures are at running 68-70 MPH. I know if I drive slower I would get better, oh well can not have everything. I also have a high profile 5th wheel which cuts fuel mileage. All other variables are close to yours includeing going up and down hills.

Ron

 

[Rogue Ram]

You are in the all park

Given what you're pulling and the grades you mention, sounds like you're where you should be.



I pull a 4k 22' trailer... ... same truck as you, I have 4:10s with a VA box. I can (but not always, and don't know why) get 12-13 mpg at 60 mph, and can pull the worst grades my State has at anywhere from 55-60 mph WOT. Worst I get pulling flat n level with the trailer is 11. 5 @ 60, but usually get better.



Unloaded I'm at 18-19 combined, 22 and on rare occasions, 23+ mpg @ 60 mph.



Regards

 

[Cummins Corvette]

I would say that is pretty good. I only get 10 pulling my little 4500# 21' TT at 65.

 

[klenger]

IMHO, the gear spacing on the 5 speed is too wide for towing in the mountains. I had an 01 with 5 speed 3. 54 and had to use 3rd gear also. The 6 speed has closer gears and fills the gap between the 5 speed's 3-4 range and works much better. I traded for another 01 with 6 speed 4. 10's and tows great. As for MPH, speed makes a big difference.

 

[X-10]

Hey Ken, as far as MPG goes, I've heard fuel usage makes a big difference also

 

[Rogue Ram]

Hey CAnderson,



I notice you have a 12 valver..... out of curiosity, how does your rig do for hwy mpg unloaded????



Rogue

 

[Cummins Corvette]

On long trips going 75 I get about 19. That was a typical number when I went from Salt Lake City to Abbotsford. Going 60- 65 I have gotten 24mpg, only once though, going from SLC to Heber and back. Driving to work and back, which is about 15 miles, I get 15-16. All that cold engine time cuts back on the mileage.