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Does this one work? Looks like a manual trans version.

https://forum.hptuners.com/showthread.php?93082-Need-a-Stock-2021-Mustang-Mach1-10r80-file

That is the source you'll see after you flash a tune. If you refuel with more than 1.5 gallons (if the learning trigger is set to 10% on your flex fuel tab), then the source will change to...

Certainly. Here's a screenshot of my current settings (2020 Mustang 5.0 10R80). The tables are stock. Parameters on the spark retard tab highlighted in green are changes I've made from stock. Not...

Here's a screenshot of my blend curves that you have also, blindly copied from a 2020 F150 file: 114346

I'm sure you've compared plenty of blend curves, but thought I'd throw that in for...

Ha, I just did that this afternoon as a matter of fact. Everything else as shown on my flex fuel tab earlier in this thread. It did mature, but it took 45 minutes of driving. Way longer than...

Sounds like you've done everything you can with the parameters you have available at the moment.

I'm not interpreting High and Low Range with respect to fuel trims like you are. The definitions in my VCM editor read:
[ECM] 21349 - Flex Fuel High AFR Range: Above this inferred AFR, the stoich...

I don't follow how the trims could ever be that large with flex fuel enabled and functioning correctly. STFTs may be high during the learning process, especially for a major fuel change but should be...

After alcohol learning is complete, if the Inferred AFR is 13.00 and the High AFR Range is 13.08, I believe the computer flex fuel logic will use 13.00 for stoich. STFT/LTFTs should be near zero.
...

As I understand it, when the Inferred AFR hits the Low AFR Range, the computer snaps/locks to using the Low AFR Endpoint for its calculations. This should happen when I fill up with E85 after...

Are you still using 10.26 for Stoich AFR Min? That is about 78% on my spreadsheet derived from the Ethanol % vs AFR table:

113651

So my thought process for the values I chose for the flex fuel...

Absolutely. I've read it's not a good idea to try to outsmart Ford on this.

Minor point...the "14.6" is actually "14.64" (you can see this if you copy/paste the table with axis to Excel, Word,...

From the info for Mustang tunes I've seen on this forum, the max update rate must not be zero, so that may be something you can ask HPTuners to add (?) I think that is the root cause of the missing...

If your inferred alcohol is fluctuating, I don't think your LTFTs will be active.

After learning, my inferred alcohol percentage locks to a value and stays there until I refuel, flash a tune, or...

My inferred alcohol percentage begins learning immediately but takes about 15 minutes to reach matured status. Might be worth submitting a support ticket to HPTuners. Could be a simple code change...

LTFT works fine on my 2020 Mustang 5.0 10R80 flex tune. After a flash, LTFTs show something other than zero after a short drive to learn the alcohol percentage, etc. According to my last log, that...