Will the mileage get better or is this what I should expect?

[Tri J]

First road trip today. Truck had 250 miles on the odometer.
Drove 430.5 miles on highways with 55 to 75mph speed limits. Didn't use cruise control.
Display showed 17.9 mpg when I got back home.
6.4/3.73

Second road trip-same destination, different route.
Drove 469.0 miles, mostly on cruise set to 70mph.
Got stuck in a 0-7 mph traffic jam on the way back for around 15 mins.
Display showed 18.0 mpg when I got back home.

 

[JMT]

Second road trip-same destination, different route.
Drove 469.0 miles, mostly on cruise set to 70mph.
Got stuck in a 0-7 mph traffic jam on the way back for around 15 mins.
Display showed 18.0 mpg when I got back home.

You have the most efficient 6.4 I've ever heard of. I can't get anywhere near that. I was all excited when I finally got a little over 14 on a 4 hr round trip.

 

[Crusty old shellback]

I saw 16 once, but as I started up Hill after the long flat straight desert, it started going down.

 

[Tdmva21]

1200 miles and best yet is hand calculated at 13.9. Mostly highway driving and trying to limit idle time. Just enough 10-15 minute city drive to the office to probably take it below 14.5…..

4.10 / 6.4

 

[Aketay]

I know this is a gasser thread, but why does the cruise control stop at 85 mph? And yes the average mpg is pretty spot on. I just love summer fuel with bio diesel.

 

[MEGA HO]

Still trying to get use to the adaptive cruise. It really does make me a gentle driver as I seem to accept the slower speed of the person in front of me and elect not to pass all of the time. Sometimes the truck aggressively slows down instead of a gentle brake application. My Wife usually says, "What are you doing?" and my reply, "It's not me it's the truck".

I like the adaptive cruise and other gadgets, except when I don't. Once coasting to a red traffic light, it turned green before I stopped so I hit resume button and it slammed my breaks really hard, like if something run in front of the truck and assistive breaking tried to avoid collision, dash light up red for a second, then it went back to normal. Wife said the same thing, "what are you doing?"... I still have no idea what was that and it was only a one time thing but had it happened at highway speeds, the end results could have been dramatic.
My only guess is that it was a small bird that flew right in front of the sensors or a electric gremlin.

 

[MEGA HO]

...
If CSX trains can move one ton of weight 492 miles on one gallon of fuel, then truck manufacturers should be working on similar hybrids that can move a 7.5 ton rig 65.6 miles on one gallon of fuel. At that rate, a tiny 10 gallon tank would provide 656 miles of range. That wouldn’t suck!
...

Trains probably get one foot per gallon until they get up to speed, once there they're just rolling down the tracks for thousand of miles and a rolling resistance of a round steel wheel on a perfectly straight and smooth steel track is 100 times less than a rubber tire on a pavement.
These hybrid engines won't work well in a truck, they'd be adding unnecessary weight.

 

[mwalsh9152]

I have a 6,4 with 4:10's Ive been able to see 19.1 on the display once, which would be high 18's hand calculated. That was keeping it to 5 over the limit on a road trip just to see what it would do. I normally cruise at 80ish if I can, and see about 16 on average.

 

[MEGA HO]

I once saw 20 on my GM 3500 with 6.0L gasser work truck... With a strong tail wind for a few hundred miles....
There are too many variables to fuel economy.

 

[Ron045]

I had just an incredible drive this morning with 20.2 mpgs. About 160 of those 182.2 miles were interstate and turnpike. BUT... I did 55 in 55, 62 in 65 and 64 in 70 speed zones. The mileage really shoots up between 55-59. I didn't make any friends with my slow driving though.

I have 6k miles on the truck now with 3k of them towing a travel trailer. I guess it's broken in.

 

[jadmt]

Just drove from Pocatello id to Moab today. Filled up in Pocatello and drove to Moab. 398 miles took 23.243 gallons. EVIC showed a little better than actual ie 1 mpg better. 35's on 2020 power wagon loaded down. The stretch from Missoula to Pocatello was really windy and was 1mpg less on both hand and evic

 

[raven_dt]

With 17k on the clock my mileage has improved to 15mpg 70hwy/30city. A huge improvement over the 12-13mpg that I was seeing the first few thousand miles. I was ready to trade it in. 87 octane, 3.73.

 

[TinGoatTravelers]

This weekend, my 2022 2500 Hemi became a unicorn. Under absolutely ideal conditions having just filled up and rolling on a stretch of 55 mph highway in cruise control - for one brief shining moment I was getting better than 20 MPG - which lasted until later that evening when I got back down around 16.5. At about 2300 miles so far - with about 400 of that towing - I’m averaging in total 14.6 according to the truck’s computer. Not as bad as I first feared. Not as good as I’d like. If I could get closer to this miracle mileage more often and more sustained - it would be quite sweet! But I’m definitely warming up to the new Freedom Machine a bit! (Note: my wife snapped the pic - I wasn’t using my phone while driving in case you were wondering…)

 

[Crusty old shellback]

Did another 400 mile road trip and got 15 MPG with cruise set at 75 MPH most of the time.
Got 18K miles on the ODO now.

 

[kevin588127]

I wonder how many are hand calculating and how many are trusting the evic. Both of my Chryslers are optimistic on the dash. My ram 1500 is usually 1-2 mpg less than the dash says. My wife's T and C is about 1 mpg optimistic. I have a co worker with an identical van and he is a freak about getting the highest mpg he can. He swears up and down that he gets 30 mpg but refuses to hand calculate. Meanwhile, the best our van has done is 23 mpg.

 

[Crusty old shellback]

All of my numbers are by EVIC. just to keep a constant.

 

[TinGoatTravelers]

I wonder how many are hand calculating and how many are trusting the evic. Both of my Chryslers are optimistic on the dash. My ram 1500 is usually 1-2 mpg less than the dash says. My wife's T and C is about 1 mpg optimistic. I have a co worker with an identical van and he is a freak about getting the highest mpg he can. He swears up and down that he gets 30 mpg but refuses to hand calculate. Meanwhile, the best our van has done is 23 mpg.

I do a little of both. 2/3 of the time they are very much in synch. Worst spread so far has been 1/2 gallon more favorable according to the evic.

 

[kevin588127]

Another variable is speedometer accuracy. I've checked mine against a couple of gps units. My 1500 had 31" tires on it when I got it. The speedometer was 4-5 mph off. It was reading faster or more mph than I was actually going. These were the factory tires. I went to 34" tires and it was about 2 mph the other way. I was able to use a tuner to get it pretty much spot on. It was really optimistic on stock tires.

I do a little of both. 2/3 of the time they are very much in synch. Worst spread so far has been 1/2 gallon more favorable according to the evic.

 

[raven_dt]

I wonder how many are hand calculating and how many are trusting the evic. Both of my Chryslers are optimistic on the dash. My ram 1500 is usually 1-2 mpg less than the dash says. My wife's T and C is about 1 mpg optimistic. I have a co worker with an identical van and he is a freak about getting the highest mpg he can. He swears up and down that he gets 30 mpg but refuses to hand calculate. Meanwhile, the best our van has done is 23 mpg.

I'm usually about 1mpg less (hand calc) vs evic.

 

[TinGoatTravelers]

I'm usually about 1mpg less (hand calc) vs evic.

Dang it - that’s what I meant - I said worst spread was a half GALLON off in favor of the evic - I meant a half MILE off in favor of the evic….brain fart….