Phoenix 6 Pos. Chip Questions

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Rig: 2001, Ford F250 Crew Cab, 7.3 PSD, Auto, 4x4, 3.73, 125K.
Mods: Stock + Stage II CAI, 4” MBRP Turbo Back.
Use: Daily Driver, Work, Tow and Play

Looking at the following tunes, but open to suggestions:
Stock
High Idle - 1,100rpm
40hp Heavy Tow
65hp Daily Driver
80hp Performance
120hp Race

Questions:

What tune offers the best average daily in-town & highway full economy when running empty? When towing <10k?

Can Lope Idle be combined with say 120 Race?
In this way, when running 120 Race setting at the light idling, it would be Loping until I nailed the fuel.
Any negative impact to doing this?

When in High Idle, does it remain drivable? (I understand that the Auto Tranny will pull if in gear, but in my case, this is desirable)

Can High Idle be combined with say 40hp Heavy Tow?

Do you offer a High Idle that also closes the EBPV, for faster cold warm-ups?
If yes, does it follow the factory time delay before closing the EBPV and idling up to protect the cold engine?

At what HP tune level should I become concerned with shortened longevity of the engine and tranny under continued use?

Are the factory TC Lock/Unlock routines maintained?

At what HP tune level do I become concerned about additional modifications, say head studs, HP Oil, Fuel Filters, Rods, etc.?

Less directly related:

Looking to future, for highway economy, and street level performance, which is a better upgrade, Propane or Water/Meth? I tend to think Propane is the best overall solution, base on its history being used on Semi-Trucks. I am really looking at these two options as a way to increase fuel economy through better fuel usage.

Looking to future, may also start running a B20 blend. Any changes or consequences to doing this without additional rig mods? Different tunes required?

I read though forum, but could not find answers that seemed to fit my questions.
I originally e-mailed these questions some time ago, but having not heard back, thought I would give the forum a try.

Thanks for your time to respond, I’m sure it is in short supply.