I don't know the exact figure. But yes, anything around that number (or higher) for a good distance will allow it to regen and get the soot level back to an acceptable amount.
Welcome, that "delete" word is getting hard to do lately. A few tuners out there that do the "deletes" since the crack down of the federal government on the tuning companies. We've got plenty of threads here pointing to a few people left that might do it.
If you have a spare stock ECM I would recommend using that during Service, as the dealer a lot times will take it upon themselves to flash in an "update".
Yes, as likely they are required by law now.. Everyone knows that if you bought something that was illegal for California and then that company got caught, why would a person be surprised they to are in the wrong?
Welcome. Hopefully the dealer takes care of you! I have a few EcoDiesel owners local to me with no issues, others aren't so lucky. I no longer have mine for that reason.
Welcome.. it sure seems like a gamble with all fires/recalls/motor issues. Just make sure you have a great warranty if you go that route, along with a good service department just in case!
Welcome! This should help you out:
https://www.ecodieselram.com/forum/threads/engine-block-heater.407/
Also, this one from Amazon works:
https://www.amazon.com/Kats-28500-Gauge-Straight-Replacement/dp/B000I8VLF2/