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It sounds to me like you are stuck in an active regen loop. With such a short drive, it is not able to complete before you are shutting the truck off. So it will start back up the next time you drive after the engine warms up. But if you shut it off again before it completes, the process repeats, and will continue repeating until it completes or throws a MIL requiring you to drive above 55mph for 45 min or more. My suggestion is to add some distance to you commute home to allow the regen to complete. You should notice a definite uptick in mpg to signify that it is done. Then go home.

This is correct. I found the exact same behaviour with my Titan. I had to drive my pickup for 32 miles to get rid of the regen.
 

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At 12k miles, averaging 22.6. This is based upon a 115 mile daily round trip to and from work. 85-90 % highway driving. Just added my third 2.5 gallon jug of def. This is roughly 10% better mileage than I was getting at 5k.

I don't know how it is possible that your Titan can be so different to mine. I have just hit 6,600 miles and I think i have added at least seven or eight 2.5 gallon jugs of DEF.

In terms of consumption, I once got 20.2 mpg but I was driving so carefully it was ridiculous. Probably better than the test drivers do when they establish consumption figures.

If anything, my consumption has got worse. The dealership was telling me that I would break through this magical ceiling when I hit 5,000. Simply no accurate.
 

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2016 Pro4x diesel 20k best mpg 23 empty. The truck does have a set in period but no drastic change in mpg. Performance wise the last ECM flash to address Dec issue some hose code etc was a good flash for me. Tires at 65 bone cold 10w30 synthetic blend or 5w40 full synthetic currently running T6 Rotilla. City average 15 highway average 20 combined average 17.1 to 17.6. Burn cycles every 600 to 650 miles for about 20 miles with 11 mpg. Top off DEC set reminder to 2500 and when it pops up add 2.5 gal. Want better mpg? Buy the ecodiesel or baby duramax and tow and hula less. All the new diesels have this smog crap the suck. This is a purpose built truck and does what it's designed to do with flying colors pulse it's comfortable as all **** and fun to drive. For a first year production run it has had some quirks and issues but nothing that one or the other local dealers has not been willing to address. Me like my Frankentruck.
 

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I'm getting 14-15 in town. Best I have seen hiway is 17.8. Most of the time I am seeing right at 17 but that is running 75-78 mph. I regen around 12-15 miles @ 8mpg typically. This engine would have been great 15 years ago before all the emissions kicked in. I do miss my 7.3, emission free, didn't even have a cat on it.
 

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Is this to be expected? I have spoken to the dealer and Nissan several times and they want me to wait it out. I just don't know what to think. I can't imagine that the consumption is going to improve by 40-50% after break in. I hear all these stories of people towing and getting 15 mpg but I can't get close. And I would add that my truck used 7.5 gallons of DEF in about 1,200 miles also seems odd.

Any advice will be welcome.
Chris
I'm with Chris 100%. This is exactly what I am experiencing. 15 mpg highway driving. DEF had to be refilled after 750 miles of driving. It sucks.

Chris - has anything changed for you? Was there anything wrong with the truck?
 

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Is this to be expected? I have spoken to the dealer and Nissan several times and they want me to wait it out. I just don't know what to think. I can't imagine that the consumption is going to improve by 40-50% after break in. I hear all these stories of people towing and getting 15 mpg but I can't get close. And I would add that my truck used 7.5 gallons of DEF in about 1,200 miles also seems odd.

Any advice will be welcome.
Chris
I'm with Chris 100%. This is exactly what I am experiencing. 15 mpg highway driving. DEF had to be refilled after 750 miles of driving. It sucks.

Chris - has anything changed for you? Was there anything wrong with the truck?
First, I don't lie, inflate, or exaggerate on fuel mileage and have a lot of disdain for folks that do as a preface to my below comments.
On mileage, after 35k my XD starting seeing pretty decent and consistent mileage unloaded and loaded.
I'm a conservative driver both empty and towing.
At 65MPH unloaded I average no less now than 19.5 (hand calculated) now and have seen 20-21 (as pictured) if conditions (no wind;no major hills). After many tanks of hand calculations and comparing to computer the computer is actually pretty accurate.
Towing I have never seen close to 15. I am currently towing my 42' fifth wheel which is right at/under 12k in overall weight across Texas for work which is where I'm pulling my new data from

Best I have done is 10.5 and worst I have done is 9. Im just glad I can stay in the double digits most of the time which I think is decent considering pulling 12k.
My F250s over the years never ever stayed in the double digits towing 12k.
 

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I'm with Chris 100%. This is exactly what I am experiencing. 15 mpg highway driving. DEF had to be refilled after 750 miles of driving. It sucks.

Chris - has anything changed for you? Was there anything wrong with the truck?
My Titan is at about 27,000 miles now.

I get mixed results with economy. I will have plenty shorter trips around town where I can get 15, 16, 17 and even 18 mpg. Obviously this is with careful driving. Normally I would regard myself as a heavy-footed driver but I have l tried my best with the Titan. Then other days, like the last 3 days, I am getting 11.5, 12 and maybe 13. And the truck is not doing a regen so not sure why that happens.

My towing (and I have just completed a 1,600 mile trip) is not great. The consumption can be as poor as 7.5 mpg (travelling over 75 mph) and up to 10.5 mpg travelling at about 60 to 65. The trailer is a high enclosed, v-nose weighing about 4,000 pounds. So not the most wind friendly but I still expect more. I have been told that 10mpg is now to be expected and good. So I have simply stopped complaining.

I did put a 50 gallon Titan fuel tank in the truck. That is an immense improvement. Instead of filling up every 170 miles or so I can drive for as long as I am comfortable now. But there is a problem with that too. When the tank gets low (and you are meant to use it well into E) it will start with its extended cranking. This appears to be a well documented problem with the Titan tanks. They say it is a Nissan thing and Nissan say it does not cause problems on the stock tank. But Nissan (the dealer) also agree that there is no seeming reason for the low fuel pressure problem to exist with the after-market tank as it is properly designed. So I am stuck on that one. Still working with Titan and Nissan dealer. We will see what happens there.

Chris
 

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One thing I should add is that my actual consumption is reliably 0.3mpg worse than the computer. So when I refer to 7.5mpg above it is likely doing closer to 7.2mpg
 

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I am at 9100 miles on my XD Diesel and I am still waiting for the switch to happen to where I get better than 15 mpg in town. I live in Denver and it seems as though the elevation has some kind of adverse affect on fuel economy but overall the fuel economy in this truck sucks.
It's pretty much always been that way concerning engines and altitude. Old carbeurated gas engines and naturally aspirated diesel engines would pretty much "die" at 10,000 feet.
Electronic engines do "correct" somewhat for altitude but air flow is air flow.
A prime athlete whose ran 3.5 minute miles at sea level his whole career will never run a 3.5 minute mile even in El Paso if he hasn't trained there ???.
The old school rule of thumb was that you lost 2.5% engine efficency for every 1000 feet of elevation.
That being said....and I have done it with Cummins ISC and ISL engines, you can use Cummins Insight to program the engine to run at sustained elevations or altitude if the vehicle will be primarily operating it's life there and see some minor gains in efficency. As started though..air is air and if you can't get enough of it you are limited.
 

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I am having similar issues. Typical in town driving I only get 12-14 mpg. On the highway driving from Houston to Dallas or Houston to San Antonio running between 80-85 I get 11-13 if I slow down between 70-75 I get round 15. I pulled a 32" travel trailer to Dallas at 75mph and averaged 8-9. I am running 33x12.5x20 tires, 4wd, with about 58,000 miles.

I have recently had 2 instances where my mpg on the computer has dropped to below 5 mpg. I can smell exhaust when I stop at a light. Sending it to the shop to see what is going on.
 

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I am having similar issues. Typical in town driving I only get 12-14 mpg. On the highway driving from Houston to Dallas or Houston to San Antonio running between 80-85 I get 11-13 if I slow down between 70-75 I get round 15. I pulled a 32" travel trailer to Dallas at 75mph and averaged 8-9. I am running 33x12.5x20 tires, 4wd, with about 58,000 miles.

I have recently had 2 instances where my mpg on the computer has dropped to below 5 mpg. I can smell exhaust when I stop at a light. Sending it to the shop to see what is going on.
When you drop to below 5MPG and you simultaneously smell exhaust at a stop light you are in REGEN and there is nothing wrong.
 

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I'm d3l3ted and get about 15-16 mpg at 75 mph. D3l3ting my truck made no difference in fuel economy. I have a leleving kit and slightly larger tires (275/65/20 vs 265/60/20). Bone stock with no leveling kit and stock tires I was still only getting about 17-18mpg on the highway. By comparison my F350 work truck loaded with all kinds if heavy equipment in it does about the same, that's with a bigger engine and way more weight. I think it's the 3.91 rear end that's killing our fuel economy though. I didn't buy it for fuel economy but it would be nice to at least be able to get the same mileage as a 1 ton pickup. And I hate the Prius too!
 

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I'm d3l3ted and get about 15-16 mpg at 75 mph. D3l3ting my truck made no difference in fuel economy. I have a leleving kit and slightly larger tires (275/65/20 vs 265/60/20). Bone stock with no leveling kit and stock tires I was still only getting about 17-18mpg on the highway. By comparison my F350 work truck loaded with all kinds if heavy equipment in it does about the same, that's with a bigger engine and way more weight. I think it's the 3.91 rear end that's killing our fuel economy though. I didn't buy it for fuel economy but it would be nice to at least be able to get the same mileage as a 1 ton pickup. And I hate the Prius too!
Just got 28.4 average this morning on my trip from Philadelphia to Wildwood, NJ

Titan X D diesel is the King
 

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If I really really try I can eek out about 23-24 on the highway but that's parking it behind a tractor trailer. More real-world it's about 20 on the highway.

Around town I try not to drive it because it'll go into regen every 150 miles and I'll end up averaging about 14mpg. My thoughts on the whole emissions mess have certainly been evolving over time. The engineer in me can't believe that what we have is the only solution they could come up with.
 
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I'm around 52k and I'm averaging 14-15 in city. My best on the highway so far has been about 19-20.
 
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