Based upon my own data collection with my own version of Cipher and data logging a new truck off the lot I was looking at to purchase. I'd say with 98% certianty its a Cipher software issue. Setting up AFR with the Cipher software with the exact ECU part number does not work either.
So it is not the tune.....it is not the truck.....it's the software and every 07 data logging with Cipher.
Lets put it this way if Nissans ECU thought it was lean it would throw P0171 P0174 code.
Also go look at the service manuals. I'm posting these two graphs directly but I hope that one of the mods can correct the pics to make sure no laws are broken. IMO Nissan has new AFR sensor for the 07 and Cipher needs to be corrected.
While typing this I got an email from Uprev they are aware and are fixing the issue.

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Well, that answered my question about fixing it.
Good detective work RB.
I have all kinds of goodies going on my truck soon so I hope they get it fixed soon.

So this condition only exist on the 07 Titan? I wonder if it has something to do with the VVT?

RB have they fixed it - hows its working for you now - i hope good i just sent for one myself - find any more bugs

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2007 Titan LE in glacier white - Bushwaker fender flares - Magnaflow catback - Nismo CDI - Pro Comp 6" lift w/extra leaf in pack - Aries bull bar w/KC lights - Putco bedrails - Tuxedo box cover - Mtec 6000k High and Low beam H.I.D - Beamer 6000kH.I.D foglights - LED taillights - Sirius Stilleto Satellite - 1000w JBL amp w/2 10" JBL subs - Headrest DVD players - 35" Mickey Thompson M/T - Compustart 9000 Alarm/Starter - up/rev

I don't think they have fixed it yet but it's on thier list to do. I think they are very busy with new tunes and Sales with a touch of R&D.

I have an 04 so I can read mine just fine. Since this only effects the 07's and likey 08's as soon as they can get that ECU broke we will not know.

Update on manual fix. UPDATE from post that Dbolmiss dropped in at MT:

Just an update for those who have 07 and cipher,Jared is on the ball.

Well, we don’t have the update ready, but here are the values for the conversion table.
2007 Titan O2 sensor.
V Value
0 10
.3 10.65
.7 11.4
1 11.75
1.3 12.2
1.7 13.25
2 13.95
2.3 15.3
2.7 17
3 18.65

OK, manual input gets a little tricky because there is a glitch in the user interface.
Go to the WB conversion under "Options" and highlight the sensor in the left column.
Click [Adjust].
Click on the ratio you want to update.
Use the up and down arrows on your keyboard to adjust the value to the left of the decimal point.
Use your right arrow to move the curser so that it is to the right of the decimal point. Type the digit for the 10ths. You will see the old 10ths digit moved to the right into the 100ths.
Use your right arrow again to put the curser between the 10s and the 100s digits. Type the digit for the 100ths.
Repeat for the other values.

Later,

Jared Ainsworth

Sounds tricky.
I think I'll test on someone elses truck before I do mine