RPM at 70 mph. 21 Ram DRW 68RFE 3:73

[dward]

It looks like I’ll be pick up a new 3500 DRW 4x4 Tradesman tomorrow.
With low inventory and high prices I found what I wanted 2 hrs from home. It’s a Granite Crystal Tradesman with 5th wheel prep, 50 gal fuel tank, manual 4x4 selection and u-connect 4 with 8.4 display. Pretty much what I want without all the bells/whistles.
I was going back and forth on the Aisin or 68 transmission bunt for my use I think this will be more than enough.
Hoping a little better mpg anencephaly this was the only 3:73 I could locate.
Anyone have RPM at 70-75 mph and what can I expect for mileage. (12-15?)

 

[NIsaacs]

About 1900 rpm @ 75 mph.

 

[Whitewolf]

What NIsaacs said for RPM. I'm getting a tad over 20mpg. 10.5mpg towing a fifth wheel at 70 mph.

 

[AH64ID]

DRW will see about 1780 rpms at 70 and 1900 at 75.

DRW mileage will also be a bit lower, expect 14-17 highway empty.

From what I’ve read the SO’s burn a little more DEF, likey due to the higher compression.

 

[dward]

Thanks. That’s a little better than I expected. 1900 should be right in the sweet spot.
I just sold an 04 SRW with 4:10 and at 75 mph I was running about 2400 rpm and 13 mpg.
I thought the older 5.9 would be better.
Even the the 3rd gens are much simpler, they can’t compare to the newer trucks for comfort and power.

 

[AH64ID]

The HPCR 5.9’s on stock tuning fall off on mileage pretty quick above 2000 rpms, especially if it was a 04.5.

 

[dward]

Yep, it was an 04.5 HO and pretty disappointing in the mpg dept at higher RPM.

 

[Bug Out]

What NIsaacs said for RPM. I'm getting a tad over 20mpg. 10.5mpg towing a fifth wheel at 70 mph.

I was dumbfounded on my latest trip to Idaho pulling the 17K 5th wheel. I got better MPG at 70 (1800-1900 RPM) with the 4:10 rears, approx 10-11mpg (until wind or hills popped up) I figured it would better at 65 or less but not the case...Pleasantly surprised.

 

[bcbender]

6500 mi towing my 16.5k fifth wheel to ID and back yielded 9mpg hand calc. (70-80 mph).

I get around 15-17 empty