6.4l terrible mpg

Grimlock

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2019
Engine
6.4
Hello all, I am new to Ram ownership and this forum. I recently bought a 19 power wagon 27000 miles on it with 35s that I do really like but the mpg is appalling. Around town I can get in the mid teens but the average is much lower because anytime you get near the gas pedal it drops to like 6 so it destroys the average. This is all in a totally unloaded vehicle. I drive 20-30 minutes to and from work on open highway. At 70 and up steady state cruising on flat level road it says 10mpg. I’m getting about 270 miles per tank also. My driving is very normal and a good combination of town and highway.
I have been looking for answers on the forums etc and while there is a lot of discussion about the mileage no one seems to have any real answers. I see a lot of people saying they get mid or high teens on the highway, if that is true it’s really concerning. I know this truck has the MDS system but I can’t tell if it’s operating or not. I never hear or feel any change in the way it runs so maybe that is causing the mileage. There is no engine light or anything so seems unlikely there is an issue with that.
Any help or insights will be greatly appreciated.
 

dhay13

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2500 6.4L Hemi 4.10's 'Off-Road'
I don't have a Power Wagon but do have a 2500 with 6.4 and 4.10's. I average 12.0 overall and about 16 to 17 on the highway but at 70 with 35's I could see it being lower. Mine is 100% stock with factory tires.
Wait till others with a Power Wagon chime in
 

OC455

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5.7 Hemi Big Horn, 6.4L Hemi 3500 Longhorn Mega cab
Power Wagons have the 4.10's. The 6.4's aren't going to get the mileage like the 5.7's do...

I put a tank of 89 octane into my Longhorn and it looked like my mileage bumped up a bit....not much. I've been running 87 since the prices of gas jumped. Finally got around to a full tank of 89 and took a trip on the I90 for a day trip averaging higher 70's on the way home. Was pushing close to 14MPGs. Wasn't quite there but close.
 

KoboldTaco

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I make everyone so mad when I say don’t buy a truck if you want good MPG. But in all seriousness, I’ve never considered the lift/tire changes and what it does to MPG so I’ve learned a ton more. I will be curious what other power wagon guys chime in with.
 

turkeybird56

Military Vet 1976-1996 Retired US Army
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Hemi 5.7
Hello all, I am new to Ram ownership and this forum. I recently bought a 19 power wagon 27000 miles on it with 35s that I do really like but the mpg is appalling. Around town I can get in the mid teens but the average is much lower because anytime you get near the gas pedal it drops to like 6 so it destroys the average. This is all in a totally unloaded vehicle. I drive 20-30 minutes to and from work on open highway. At 70 and up steady state cruising on flat level road it says 10mpg. I’m getting about 270 miles per tank also. My driving is very normal and a good combination of town and highway.
I have been looking for answers on the forums etc and while there is a lot of discussion about the mileage no one seems to have any real answers. I see a lot of people saying they get mid or high teens on the highway, if that is true it’s really concerning. I know this truck has the MDS system but I can’t tell if it’s operating or not. I never hear or feel any change in the way it runs so maybe that is causing the mileage. There is no engine light or anything so seems unlikely there is an issue with that.
Any help or insights will be greatly appreciated.
A heavier truck, lil bigger than 1500, lifted, 35's, pushing more mass, you are not gonna get Prius mileage, just saying. Yours may be a bit low, but driving habits, conditions, speed, temps, traffic, your particular habits on driving, even PSI and good tier fuel all average in there on MPG, just a saying.

ADDED: Now I just got a 1500, stock height, Stock tire size, but heavier AT3W tires. I try to not destroy the skinny pedal, no hard take offs from lights, drive reasonable, carry no extra weight in truck, use good fuel, keep an eyeball on psi of tires (when cold), almost always use CC on highways, and I can get 13-17 in town, and maybe low 20's on highway, but usually 18-19 ish, and a constant 12.2 when towing total of 6-7,000 lbs.. But a lot goes into driving habits and conditions, etc.
ALL above IMHO .....

ADDED MORE: Unless the MDS system was tuned out, you may not even notice it, especially with the 6.4 more than a 5.7. Run in manual mode gear 8 and that keeps the MDS off, but U have to go into it every time U put truck in drive. Again, back to conditions, truck conditions and driving habits.
 

SniperDroid

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Eaton Township, Ohio
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2019
Engine
6.4 Hemi
I didn't buy the TRUCK for mileage, I bought it for towing power and comfort. I don't use it much for regular driving, mostly towing the camper. It weights about 7500 pounds, and maybe another 1500 of cargo in the truck. I get about 9 mpg average while towing with the 6.4 and stock tires. I'm not complaining. We have a trip comming up from Ohio to South Dakota next month. It will be an adventure....
 

Fatbob Frank

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Sure the mileage in my Power Wagon is terrible, but better than I thought it would be when I ordered it.
Frankly, I only lost about 2mpgs after trading off my 1500 Laramie w/3:21 and 33's...
 

mtnrider

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2016
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6.7 Cummins
I "Had" a power wagon and what you are getting for mpg falls right in line with what I was getting. I see some people claiming much better but that is a hard pill to swallow for me.

At the end of the day, you buy a PW for it's offroad abilities, not towing or mpg.

.
 
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