2020 2500 6.4 Fuel mileage

[Caleyvtwin]

This may be a repetitive question but I haven’t seen anything in my searches. My wife and I are looking at buying a 2020 2500 6.4 3:73 for a combo daily driver/camper towing truck. I am curious what everyone is getting empty vs loaded fuel mileage.

 

[kevin588127]

8-10 pulling, 10 city, 17 highway, 12-13 combined so far. Only have about 1700 miles on it. I've hand calculated every tank and so far the computer is pretty accurate.

 

[jetrinka]

Unloaded highway I brush past 16. Unloaded mixed I get 12.5-13. Towing our 5k GVW TT I get 9-10.

Got a PW with the 4.10 gears

 

[jabartram]

9 to 11 city

 

[762fmj]

Longhorn, CCSB, 4.10 gears and posi. Computer indicates 15 cruising 80 on the highway and avg after a week is 13.2. Haven't hand calculated anything yet. I also have a bed cover on it which may effect it some, but I doubt it since my numbers are pretty much inline with others'.

 

[762fmj]

Also lots of mpg discussion on this https://hdrams.com/forum/index.php?...-better-or-is-this-what-i-should-expect.8694/

 

[Firebird]

My 2019 had 4.10 gears, and I only got around 8mpg towing 10,000 pounds

 

[Caleyvtwin]

Thank y’all for the response. I did go look at that thread, and it was helpful.

 

[dieselscout80]

8-10 pulling, 10 city, 17 highway, 12-13 combined so far. Only have about 1700 miles on it. I've hand calculated every tank and so far the computer is pretty accurate.

I see similar MPG with 4.10 6.4. The one unknown for me is the heavy towing as so far the heaviest tow load is 9.5 bushhog.

 

[Wanderlust073]

2020 2500 6.4 3.73 - just got a bit over 15mpg taking it through 350 miles of colorado carrying maybe 800lb payload, no towing. Lots of climbing and mountain passes. Better than I expected.

 

[jadmt]

I don't tow but with 4.10's I get 15-18mpg on the highway 75mph get lower but 60-70mph get good mpg. this is a 2020 with 35's and calibrated speedo.

 

[gojohniego]

1500 miles...around 10 mpg in town around 18 mpg expressway at 70 mph and towing 5k lbs 11 mpg expressway 3.73

 

[mwalsh9152]

I have 4:10's and I average 14.5-16 mixed driving, mostly highway in traffic. Normal highway trips about 17 average, but I have seen as high as 19 if I slow down to the speed limit.

 

[RIDEaCANYON]

22 Power Wagon with everything in my signature and I can get 18-19 and flirt with 20 (average) on highway if I keep it around 72mph and use cruise. Drops to more 14-16 running 75+. Definitely better even with PW 4:10's and 35's than my 2015 2500 6.4L was with 3.73's and less aggressive tires. Dang near a hybrid now. haha

 

[Lerker]

This has to be literally the most discussed topic with the hemi. You couldn't find anything on it?

 

[Grey65]

I got 12-13 city, 14-17 hwy and 9-11 towing a 10k 5th wheel.

 

[G’Dave]

This is what I've experienced with a 2022 Laramie 6.4 Hemi, 4.10, CC LB:-
7.5-10 around town, unloaded
15-17 on the highway (unloaded)
9.5-14 on the highway pulling a 7x14 cargo trailer (overall height 9.5', about 5000 loaded).

My highway towing mileage varies quite a bit depending on conditions (speed, cross winds, hills).

In general, it's probably pretty heavy on gas compared to a Cummins, but this is offset by initial acquisition cost of vehicle (roughly $10K less); price at the pump ($2.89 vs $4.69 today in St. Louis), no DEF, MUCH cheaper general maintenance costs, etc etc.

BUT - the Cummins is the way to go if you're mostly towing "heavy" on the highway.

 

[Dan5Gen]

However it shakes out, do yourself a favor... install a quality cold air intake and free-flow exhaust. Recommend leaving the resonator in place to keep peace in the neighborhood. I picked up 2.5+ mpg across the board and with today's fuel prices, the mods will pay for themselves in short order. Performance will improve as well because it's breathing better, but one must resisit the urge to jam the skinny pedal.

 

[Gondul]

OEM is already a CAI... 'more air' that the engine can't use doesn't help and only makes more noise (unless you simply want more noise).

 

[Dan5Gen]

10-4 however, the after market S&B has a huge box and filter with an additional intake port. More air equates to bettering breathing, providing improved mileage and performance.