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What kind of hwy mileage are people getting?

38K views 88 replies 52 participants last post by  plumber19832003 
#1 ·
Last week, I got my best to date, and part of it was in some heavy traffic. I got 627 miles with an average of 18.5 from what the computer said. Most of my freeway miles I had the cruise control set at 75. I did put in slightly over 35 gallons when I filled up:eek: My truck has about 4500 miles on it now. I love this thing.
 
#2 ·
I'm always running the cluster in Metric because Canada... but best I have seen was on the highway and my average went down to 10.8L/100km (21.77MPG), but fairly consistently in the low to mid 11L/100km (highway). In town and such I have yet see a tank average over 12.7L/100km (18.5MPG)
 
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#4 ·
Just got back from a 2500 mile trip to Kentucky in my 2500 HC. With a slight tail wind for the first 300 miles I got 23mpg, then at the 900 mile point, regen took me down to 22.1. On the way home I was getting 22.5 until I hit a regen and a 30mph head wind. Ended up the last 1300 miles at 20.4. Overall was very close to 21.5. Most of the miles were at 70mph. With 6000 miles my On Star phone app shows17.6 lifetime average. About 400 miles of that was towing my 35 ft. travel trailer. I'm satisfied.
 
#5 ·
I have had mine about 6 weeks and have 12,100 miles on it and about what Ramler gets for mileage. Got a little better with my 2007 but with mods and no emissions. Just sold that one with 650000 miles.
 
#6 ·
Im getting about 21-22 mpg on my 3500 SRW and I have just under 2000 miles on it. I get easily 600 miles to a tank.
 
#8 ·
Only towing I've done so far was a 19' v-nose sled trailer and a 27' car hauler. 17' was a short trip to sell to the new owner, and my 27' was just a 250km trip home. :confuzeld

I hadn't seen this thread until after both of those things so fuel mileage wasn't the most important thought on my mind.

Also, I've only got about 6,500km on the ODO currently... wanted to get some decent mileage on the truck before I really started using it. I can definitely give towing mileage feedback in the near future.
 
#10 ·
Picked up my new 5er in Longmont CO two weeks ago. Trip home, Denver to Casper, WY, 7.1 mpg bucking a 20+ mph head wind. Casper to Worland, 11.1 no head wind. Cruise set to 68, pulls like a beast. 5er is a 2018 Solitude 310GK, combined weight of 23,300 lbs. Next trip I will load her down!

Mileage running empty seems to be averaging around 18.5. Mileage will jump to around 22 and then regen sucks the mileage out.
 
#14 ·
5,900 miles on truck, Lifetime avg is 15.5. Just returned home from a 3,400 mile trip from cooler temps to the Gulf in MS. 90% interstate driving, trailering a Uhaul auto transport with a car on it and very little weight in truck, cruise set at 73 most of the time. Avg 14.9 mpg / Avg 1 gal DEF each 680 miles, 75psi all tires, (unloaded daily driver use 65 fr / 50 rear). Better fuel mileage in the warmer weather. Truck has plenty of power and rides smooth. Very satisfied so far!
 
#22 ·
Within the last month I have taken two long distance trips. First from Chicago to Charleston, SC and back. Second from Chicago to Killeen Texas and back. Both trips with the A/C on and going about 3-5 mph over the posted speed limit, so averaged about 75 on all trips. On both my hand calculated MPG was anywhere from 21 to 23, depending on the hills, or lack thereof. I am extremely happy with the overall performance of my '17 model, which is currently sitting at just under 18,000 miles.
 
#25 ·
:thumb::thumb: those are awesome numbers
 
#24 · (Edited)
yea some pretty impressive claims to be sure.

Add in your Regen and then re-do this thread. Add cost of DPF fluid.
Then lets see where you guys are at.?

for the record - Truck wiht me in it, Tool box - Full Titan & slip tanks - ~8000lbs
Hiway at 75 . 20 - 21 avg.
Towing 12k 5r . 10.0 avg. (BC Mountains)

EFI Live on 3 (45hp)
265/70R-17 BFG Rugged Trails
No Lift - levelled

Calculated
 
#27 · (Edited)
I love all the insanely high mileage numbers. Somebody averaging 20+ mpg in a 8,000+ lb truck kinda cracks me up, 'cause it's obvious the truck isn't working. I'm all about freedom - if you can afford it, and that's what you want to drive and want to do with it, have at it.

I'm also all about OCD..

My '17:

80,922 miles

5,048 pulling an 8.5'x16' enclosed trailer, averaging approx. 5,000 lbs

19,142 pulling a 28' GN, loads all over the map, from approx. 6,000 empty, to roughly 20,000 lbs of trailer, skid steer loader, and attachments - roughly half of those miles loaded, and half empty

3,187 pulling a 36' fifth wheel


6,193 gallons of fuel
125 gallons of DEF


I've seen the 50-mile average numbers in the neighborhood of 20 mpg when running empty, but when you do other things with it, that number is meaningless. The concern over mpg is primarily a financial matter - cost of fuel per mile, per year, etc. This works out to a very tiny hair over 13 mpg for it's now 20-months-and-five-days career. Given what I've accomplished with it, I'm more than happy with that.
 
#28 ·
I am just over 1,300 miles on my 2018 and in mixed city/hwy driving am seeing 13._ MPG.

the Same type of driving in the LMM I sold was right around 15.5MPG
 
#29 ·
We recently completed a 73 day, 11,500 mile trip from Florida to the Pacific Northwest and back. 7,600 miles were done pulling an 8,000# Airstream travel trailer. Our average mileage for the whole trip was 13.26 mpg and the average price per gallon of Diesel was $3.24.

Brian
 
#30 ·
Overall life time average is right at 16.2 with about 15% of the mileage towing.
Maybe 30 % highway and the rest local.

As for highway mileage I would say I'm at about 19mpg. I some times see 24 on the lie-0-meter and right then a regen will kick in and it will go to 22 yet when I actually buy fuel and hand calculate it I see like 19mpg to 20 mpg. I have yet to ever have one full tank run highway all the way.
 
#31 ·
Wow, some pretty wild mpg numbers in this thread!
My 2017 3500 srw L5p gets an honest 16.5-17 not towing, and all my roads where I live are 55-60mph. I do a fair amount of idling while riding property lines and etc.. interstate highway, my cruise is usually set close to 80, and I get 17-17.5.
Towing my 5ver, and boat, gross about 26000, 75mph on the highway, gets me right around 11.
Pulling the race car trailer, weighing about 12000, plus the truck, it hangs around 11.5, running 75-80.
I also have 275 cooper stt pro mud tires, front and rear road armour bumpers, which I’m sure makes the mileage worse. The retrax bed cover didn’t change mileage either.

It’s a truck, that’s meant to work. And this mofo toes like nobody’s business! I actually wouldn’t care if it got 10mpg, yes, it tows that good!!!
 
#34 ·
first 9500 miles averaged 17.6 us mpg, hand calculated. (yes, I've been logging every fill)

I frequently do a 55 -60 mph run on rural 2 lane and if not windy it will run the 'recent average' up to mid 20's.
I usually don't refill til about 600 miles/1000km or so, and have never had a full tank average over 20 mpg.

Most daily driving. A little light towing.

Speed makes a huge difference, as does driving with lots of stops and starts.
Very little grad or elevation changes in this area.

It always runs a little less at 70 -75 than at 55 - 60.

Headwind or quartering wind also makes a difference - just like speed.

When running steady speed, the average will drop 10 mpg during a regen -- and of course recover when regen is done. Typically about 20 minutes/20 miles.

Regens usually about 400 mile interval, but occassionally less if more than usual idling or city driving.


Currently just under 12,000 miles.
Added def about 6500 and calculated about 1100 miles per gallon.
It's not asking for more yet. Like my LML, operational cost of DEF is insignificant. ($4/gal / 1100 miles/gal = $0.0036 per mile)
 
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#36 ·
Omaha to Breckenridge, Co and back was about 1,300 miles and averaged 17.3 mpg running 80ish on the Interstate.
 
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