2015 Information Display DTE calculation error?
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Mountain Pass
Joined: Feb 2010
Posts: 113
Likes: 6
From: Pacific Northwest
2015 Information Display DTE calculation error?
In the "Settings" menu, under "DTE Calculation", it appears there is an error in programming. There are two options to select: "Normal" and "Towing".
When towing is selected, the DTE number goes up. When "Normal" is selected, the DTE value goes down. For example: this evening on a full tank, the DTE number was 780 with towing selected. When I changed it to normal, the number went down to 550. This seems backwards. Ford, care to comment??
2015 F-150 XLT FX4 3.5L EcoBoost
When towing is selected, the DTE number goes up. When "Normal" is selected, the DTE value goes down. For example: this evening on a full tank, the DTE number was 780 with towing selected. When I changed it to normal, the number went down to 550. This seems backwards. Ford, care to comment??
2015 F-150 XLT FX4 3.5L EcoBoost
Last edited by His/Hers 6.0s; Jul 7, 2015 at 01:59 AM. Reason: Added vehicle information
Thread Starter
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Mountain Pass
Joined: Feb 2010
Posts: 113
Likes: 6
From: Pacific Northwest
2015 F150 XL 2.7L EcoBoost ok
Apparently this issue is isolated to a particular model. My 2.7L work truck functions as you'd expect. Ford this is a modest safety issue. I just took a 3500 mile vacation through the desert southwest towing a trailer in 100+ degree weather and there are many spots where it's 100 miles or more between gas stations and a DTE calculation that gives you a bigger number when set to towing could help create an out of fuel situation.
Junior User
Joined: Feb 2013
Posts: 74
Likes: 0
From: Victoria Harbour ON
DTE is just a estimate and should not be used as fact, I would suggest if your concerned about distance between fueling stations then maybe a spare can of gas should be taken with you on your trip
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
That's not the point. The issue is that there is a problem and Ford needs to address it.
Junior User
Joined: Feb 2013
Posts: 74
Likes: 0
From: Victoria Harbour ON
Have to disagree, my truck displays properly. This just may need a reflash of the software by the dealer. I would be interested in how may 3.5's are having this problem.
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
I'm not saying it is a problem with all the trucks. But it is at least a problem with His/Her's truck, so Ford needs to fix it.
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Lead Driver
Joined: May 2015
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From: Mts. S. of San Francisco
Have to admit that I don't pay that much attention to it. However, I do notice that the DTE calculation adjusts dynamically to whatever your instantaneous mileage happens to be. When I'm going up the mountain, my DTE goes down quite a bit, but when I'm going down the mountain, the DTE magically goes back up. My instantaneous mileage going down the mountain is nearly 30 MPG.
Fleet Mechanic
Joined: Dec 2013
Posts: 1,268
Likes: 35
From: Utica, Nebraska
I'd use something like gasbuddy app on your phone if you have one to help out or plan a trip accordingly. On any vehicle equipped with a DTE, I never pay any attention to them since they are inaccurate. Doesn't matter if its new and improved, last thing I'd want to do is trust a computer for doing the math for mileage. Rather just fill up when you can on a trip, especially while towing. I haven't seen any Ford reps on here since the Q&A session a while back, do they even frequent the forum anymore? I agree with Tim and do it by hand until something gets figured out.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
I guess there's a remote possibility that your Tow/Haul mileage mileage is better than your normal mileage. In that case the DTE, which probably uses the average MPG for that driving mode, would show a longer distance for T/H than normal.
When you switch over to T/H in Settings does the average MPG change?
When you switch over to T/H in Settings does the average MPG change?
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Took my truck on a drive today and I played with the DTE calculation. But, I'm confused with the results:
Also, I can't find anything in the owner's manual that explains how the DTE calculation is done, nor what the difference is between Normal and T/H for DTE. I downloaded the manual as a pdf and searched it, but the few hits for "DTE" didn't explain whatsoever about how it is done. But, if anyone finds it, please let me know.
- The DTE showed 690 miles on Normal, but it went to 654 miles when I switched to Tow/Haul - and when I immediately switched back to Normal the DTE stayed at 654.
- About 6 miles later the DTE showed 648 miles on Normal, but went up to 677 when I switched to T/H
Also, I can't find anything in the owner's manual that explains how the DTE calculation is done, nor what the difference is between Normal and T/H for DTE. I downloaded the manual as a pdf and searched it, but the few hits for "DTE" didn't explain whatsoever about how it is done. But, if anyone finds it, please let me know.
Fleet Mechanic
Joined: Dec 2013
Posts: 1,268
Likes: 35
From: Utica, Nebraska
Curious to know, with stock tires is the speedometer even dead on? I know that at least in the early 2000s and previous Ford allowed a +/- 3mph difference between the speedometer and tire size reading. I know on my truck running stock 255/70/16 I have to drive at 58mph on the speedo to be going 55. But with 265/75/16 its dead nuts on the money. I know its a 16 year gap but it should be relevant.