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Eco Diesel Mileage

58K views 224 replies 88 participants last post by  philbytx 
#1 · (Edited)
All,
Purchased a 2014 Limited 4x4 eco diesel in July, have put 2200 miles in it and have been slightly underwhelmed by the mileage. I have gone on three 200 mile plus road trips and have managed to eek out 26.1 miles per gallon on a highway trip. Around town it seems the best I can do is 20.8. I have really tried to go easy on the throttle and drive conservatively.
Sticker said 21 city 28 highway 24 combined.

What are the rest of you seeing?

Is there something I need to have the dealer look at?

From what I am reading on this forum many of you are getting much better numbers than what I am seeing.
 
#2 · (Edited)
It's highly dependent on circumstances. In the winter, on winter blend diesel, it will get worse. For the winter months when my usage is primarily short, in-city hops I average in the 13 – 17 mpg range.

My all-time best tank average was 26.15 mpg (over 19.3 gallons); my worst was 17.61 mpg (over 20.31 gallons).

My perspective is that—given the price of the diesel option and the cost premium for diesel—people should not buy the diesel intending to come out ahead. Buy it for the torque, the highway range per tank, or, hell, even the sound, and you will be happy. Buy it in order to save money and you won't.
 
#3 ·
Just turned 13,000 on my baby. I can average 32 on flat highway such as Casa Grande, AZ to Yuma, AZ. Recently pulled a 3500 lb trailer from Casa Grande,AZ to Creede,CO and had an average of 21 mpg, this is great considering some of the hills we pulled.
 
#4 · (Edited)
Just turned 13,000 on my baby. I can average 32 on flat highway such as Casa Grande, AZ to Yuma, AZ.
Just curious, what speeds was this at? Have you been on to San Diego? If so, how much do the steep, curvy grades between El Centro and San Diego beat up on the mileage?
 
#10 ·
Have been seeing 24-26 around town and easily over 30 at 65 MPH on the highway...5500 miles... SO far pretty happy !:)
 
#11 · (Edited)
17,000 miles on a 4X4 Limited: 33mpg at 65MPH on the flats, 28mpg at 70MPH over the same, minus 4mpg with a Thule Sonic box and Yakima Whispbars on top, minus an additional 7mpg towing a 2000 pound T@B trailer over the Rockies (tires at 37 psi). City driving at about 19mpg.

Wind also plays havoc with mpg and whether from the front or side, wind can reduce milage by several mpg.
 
#13 ·
'14 limited 4x4 6556 miles(purchased new 01 July 2014), routinely plunking 28+ city. Last long trip I did was on my way back from the cabin: Superior-Duluth-back to superior-Ashland-Wausau-Madison-Milwaukee and back to madison(over the course of 2 days). Tank wasn't empty when I filled up with #2 diesel, but both the EVIC and hand calculations were almost identical @ 31.9.


Sent from NSA Surveillance Van #574
 
#15 · (Edited)
Got the average for the tank up to 39 MPG this last weekend.

Filled up in Dublin, OH near the freeway.
Dublin, OH to Ann Arbor, MI. ACC set at 57 mph unless the limit was under 55.

The drive back to Columbus we saw the tank come down to 35 as we took a different route and side-tracked a little to find a place to eat.

Still, this is fantastic. 57 is the speed we generally drive. This was all in the 9000 mile range.

Edit: Typo
 
#16 ·
'14 Overland build date 28 Sept 13 now with 17800 miles
Travelled phx to Laughlin and got 29.2 over there and 30.1 back. Speed limit to 5 to 7 over and did not push it never getting go pedal to floor.
City average is 24.8. We try to run constant min B5 fuel. Very happy with this but yes we bought it for the torque and to be able to tow.
 
#17 · (Edited)
14, aero.. recent running on I-70 mo-ut, ut-nyc, back to mo... running +5, overall average 27.9 mpg, 7500 miles on the gc.. avg are:
75+=~25-27
65-74=~28-30
<65=~32+
First Exhaust Regent @6800, after a week of east coast stop and go
3 "service electronic throttle control" cell's, car still running

YMMV...
 
#18 ·
Long drive - Texas to Minnesota I got 30 mpg. Around town I get around 25, and 30 on longer trips. Towing I get around 18
 
#21 · (Edited)
I live in the city, and while I commute 10+ miles each way per day, I can't seem to get average tanks above 27mpg. You can click on my Fuelly badge below for more details. I see those of you who get 30+ and am envious.

I just started calculating my city/highway splits by taking my elapsed trip time and dividing that into the miles driven. It turns out that I am driving more like 60/40 city/hwy whereas before I estimated that I was doing the opposite.

Even my long trips don't get higher mileage because I usually try to do some offroading at some point, and that eats up my fuel. :lol:

Compared to my 2012 Hemi, I'm getting 10 mpg more in the diesel. Here in So Cal, #2 diesel is the same price as 87 octane, so even with the higher price of the diesel engine I am still on track to have a lower TCO with a diesel overland than with the Hemi limited.
 
#22 ·
The mileage has been underwhelming for me as well. I have 21,000 miles on my sulfur unicorn. I average around 25 mpg. A lot of highway driving. I bought it because I put about 20-25k miles a year on any car I drive and I want to keep this one for 10-15 years so I can buy a few fun cars every 5 years and just have this one as my daily driver. When warranty is up going to get a wrangler for the beach.

Long story short gas mileage is not the most important reason to buy a diesel. The engine will last you about twice as long if not longer then a gas (probably more like somewhere between 2x and 3x).

Not sure if it will matter for resale either, but I imagine once they get over 100k miles that will be a factor for people as a diesel is just breaking in where a gas engine is starting to show a few greys.
 
#23 ·
My average over the last 7 months has been about 23.4 mpg (manual calculation), I also noticed no mpg change between winter and summer blends, not sure if they use a winter blend or not here in NE OK. I probably drive 80% highway/20% city and mostly commute to/from work, I was expecting my MPG to be a little better but I guess I can't complain. Another thing is my manual mpg calculation always comes out at least 1 MPG better than what the EVIC shows. Here's a screenshot from my app: Text Font Screenshot Number





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#24 · (Edited)
My average over the last 7 months has been about 23.4 mpg (manual calculation)
Based on your data, your mpg seems about right. Your fill interval is ~14 days average and your averaging 23.4 on a 20 gallon fillup. Thats about 470 miles every 14 days. Your driving 33 miles a day. The drivetrain won't reach peak efficiency until it warms up...which takes 10 miles or more depending on ambient temperature. Best case, you are driving 17 miles each way. Only 7 miles are after warmup. If you have more drive cycles than work and back, efficiency goes down due to the shorter trips.

I'm a field engineer and ususlly drive 80% highway and most drive cycles are > 30 continous miles. My overall per tank mpg usually calculates to 26.5 but has been as high as 30 on longer interstate trips at 70mph.

During the holidays I was off work a few weeks and observed similar results to yours as I only drive shorter runs. Thats my theory and follows what I have seen with mine.
 
#28 ·
Love the truck and love the diesel. My purpose for the post is to see if there is something specifically faulty with my vehicle as it seems to not measure up to the MPG claims on the window sticker.

As I have read through the responses, most of the respondents appear to be getting closer to the claims on the window sticker than what I am experiencing.



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#29 ·
10366 miles on my overland 4x4.

Ran 28.5 mpg from Koons to Syracuse when it was brand new.

Over the next 10k I go from about 24.5-25.5 mpg on the EVIC. More city than highway driving, not to mention I'm not the lightest on the throttle.

My 2010 WK with the hemi averaged 12.5 on the same drive cycle.

Can't help but say I have a huge smie on my face.


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#30 ·
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