6.7
Senior User
Joined: Jun 2012
Posts: 109
Likes: 0
I get 13 - 15 around town and 17 highway with pretty much stock everything. Better than I expected for a big heavy truck.
I don't see how people are averaging 20mpg on the highway in a stock truck unless they're going 55 mph or less with a no hard acceleration whatsoever.
JD
I don't see how people are averaging 20mpg on the highway in a stock truck unless they're going 55 mph or less with a no hard acceleration whatsoever.
JD
Senior User
Joined: Aug 2007
Posts: 436
Likes: 0
From: E Washington
they are going 55 mph and reseting the lie-o-meter going a mile then stopping and calling it 20 mpg. I do not think it happens the truck weighs 8000 pounds it is not going to get 20 mpg constant driving it may say it for a few miles but nobody is getting that on average for a tank of fuel....... enjoy getting 17 and call it a day.
Fleet Owner
Joined: Mar 2012
Posts: 20,125
Likes: 15,849
From: Wisconsin
I just got back from a 500 mile round trip down to Illinois for the weekend. I wasn't towing anything (for once) and got 17.0 on the way down and 16.8 on the way back. There was a lot of traffic to pass on the way home. I wasn't beating on it, but I wasn't taking it easy either (prolly averaging 75 mph or so). I was happy with my mileage with the 35's. Not bad at all. 2 regens total (that I noticed). Once on the way down and once on the way back.
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Posting Guru
Joined: Feb 2010
Posts: 1,411
Likes: 1
From: Opelika, AL
last week i drove to montgomery and back (about 65 miles each way). I hit reset when i got on the interstate and when i pulled in to my driveway at the end of the day i averaged exactly 20mpg. That was setting the cruise at ~69mph and taking it easy on the little bit of intown driving i did at each end of the trip.
cruising around town (back and forth to work 8 miles each way) i get between 16-17 when i take it easy. If i drive a little more aggresive it drops to 15.
cruising around town (back and forth to work 8 miles each way) i get between 16-17 when i take it easy. If i drive a little more aggresive it drops to 15.
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Logistics Pro
Joined: Oct 2010
Posts: 3,595
Likes: 63
From: Texas
When my rig was stock (no lift, big tires etc) I would get over 20 mpg at 70mph hand calculated and by lie-o-meter. That was also in central IL where we have an abundant amount of bio-blend diesel. When I traveled out of state where there was "normal" diesel and less wind (IL is windy as all can be), I got even better mileage.
Even when lifted etc, I averaged 18.9 mpg coming from central MO to central IL using "normal" diesel". Take off about 3-4 mpg for bio-blend from my experience.
I had the 3.55 elec locker.
Even when lifted etc, I averaged 18.9 mpg coming from central MO to central IL using "normal" diesel". Take off about 3-4 mpg for bio-blend from my experience.
I had the 3.55 elec locker.
Senior User
Joined: Oct 2010
Posts: 324
Likes: 1
From: Rural Central Illinois
If you have a 3:31 ratio, that would incrementally improve your mileage. The lower the ratio, the higher the number (as in 4:10) and in theory, the lower the fuel mileage. From what I've read, there is only a small difference in mileage between the 3:55 or 3:31 but the 3:31 gearing would be better.
And incidentally, on the highway I can get 20mpg (hand and computer calculated) but again, that's on the highway (80% of my driving). After a month in my new truck I have 6500 miles and I am averaging 17.5 mpg in overall mileage. That includes city, highway and some towing.
And incidentally, on the highway I can get 20mpg (hand and computer calculated) but again, that's on the highway (80% of my driving). After a month in my new truck I have 6500 miles and I am averaging 17.5 mpg in overall mileage. That includes city, highway and some towing.
Fleet Owner
Joined: Mar 2012
Posts: 20,125
Likes: 15,849
From: Wisconsin
How does that work if the circumference of the tire is the same? Just because the wheels may be different circumference, the tires may or may not be a different?
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
I know it's strange but stock 18"s come with higher profile tires (85) and 20"s come with 65's. So the actual circumference is nearly identical. Once we go with new tires and change the sizes things are different if one chooses to change it.
Don't quote me on the 85 profile for the 18" wheels, that's just a guess. It could be 75 or 95, I'm not sure. They are taller than the 20" tires though.
I just got 55's put on a couple weeks ago and on 20" wheels they result in my speedo being 5mph fast. I shoulda got 65's but with the 295 width I was afraid they would rub. I've got to get my dealer to adjust my truck to think it has smaller wheels.
Don't quote me on the 85 profile for the 18" wheels, that's just a guess. It could be 75 or 95, I'm not sure. They are taller than the 20" tires though.
I just got 55's put on a couple weeks ago and on 20" wheels they result in my speedo being 5mph fast. I shoulda got 65's but with the 295 width I was afraid they would rub. I've got to get my dealer to adjust my truck to think it has smaller wheels.