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Fuel milage for 3500 HO

Benson

Benson

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I know I didn't buy my 3500 Limited dually for the mileage but I only have about 450 miles on it for the first week and I'm getting around 14 mpg for the first tank. What are some of the numbers that I can expect after a few thousand miles?
 
If that is a fair bit of around town, that's not bad. Historically, a Cummins will take a step up in MPG @10K, and then @30+/-. Have you put your truck on a scale? Probably 9K lbs?

Hitch up to something heavy and put her to work. That's what the Cummins likes best, and will help break in.
 
I am getting 15.6 on my first 600 miles with a crew cab 3500 HO SRW. I did put my truck on the scale and it came in at 8320 lbs.
 
I have about 2000 miles on my '19. So far I am getting 18.6 MPG driving mostly country roads, speed limit up to 50 MPH and a bit of in town as well as highway driving.
 
I tested mine this weekend since I was making the same trip multiple times. At 75 MPH I get 15.6 MPG average, at 70 MPH I get 18.2 MPG and at 65 MPH I get 19.8 MPG. I was shocked to se that big of a difference between 70 and 75. 2019 3500 Crew Cab SRW HO Aisin.
 
about 70-75mph i got 18 MPG. 3500 mega cab HO. Flat freeway driving..
 
I have a H/O DRW 4:10’s and get 14.2 in town and 18.3 on HWY driving long distances.

Edit: This is without load and only going 65 on CC.

Respectfully
Chris


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Last edited:
To follow up on my post above, I am now over 30K miles, and, unlike my '05, I have seen ZERO improvement in MPG. 15 is about as good as it gets in normal use. Saw 16 on one tank of empty highway use.
 
I use Fuleio to keep detailed records of my diesel usage since I bought my 2019 Ram 3500 HO.

I had the truck lifted and 37" tires installed. Sometimes I tow a 15k trailer. So, here are 4 different MPGs:

Before the truck was lifted and 37" tires were installed:
Average towing 10.2​
Average not towing 15.8​

After the truck was lifted and 37" tires were installed:
Average towing 9.5​
Average not Towing 14.5​

Lifting the truck and installing 37" tires reduced the efficiency by about 1 MPG.

I don't use the truck computer to calculate MPG. I manually calculate the MPG by dividing the number of miles driven by the number of gallons of diesel used.

EDIT: This was measured over 22,000 miles.
 
2020 3500 SRW crew cab with 2500 miles. I’m seeing 18 mpg on the highway not towing and 10 mpg towing a 10,000 lb fifth wheel
very pleased for such a large truck
 
2020 3500 HO but under 1,000 miles. Getting 15 around the suburbs and 18.5 on the highway.
 
2020 3500 dually with 6.7. Did 500 miles over the weekend just driving to a party and got 15.9 on the highway, 6500 total miles on truck
 
21 3500 HO SRW
3800miles currently
900mile trip from NC over mountains to Knoxville TN, then up to PA averaged on computer 19.1mpg. 600 mile trip back from PA to NC on computer averaged 18.6.
200 mile trip in western NC towing 2200lb trailer and 96 ram 2500 12v (~9k total) average 10.8 mpg.

I calculated the 900 mile trip and came out to about 18.4 mpg. 70-65mph mostly. I have the 50 gal tank and go 700-750+ miles before filling up with still an 1/8 or so left in the tank.
 
Is it true that the SO engine/68RFE gets better fuel economy than the HO engine/Aisin? Somebody told me that if fuel mileage was really my main goal, to get the SO engine.
 
2019 3500 DRW H.O. 20k miles. 14-16 mpg. Never seen below 12 or above 17. 4.10 gears.
 
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