FYI: Full Regeneration capability when battery is below 75% charge
 

Most of us know re-gen is limited at 100%, and previously we believe ( Elon's tweeted for the Tesla's) it is best when State of Charge (SoC) is below 80%

However, according the the the "Regenerative Braking" Tutorial Video, that is only available via the Audi IQ App* *not on Youtube), at time mark -1'00" ( or 1'18" into the video)
it states that :

"Full Regeneration capability when battery is below 75% charge"

FYI, on the iOS side, the "MyAudi IQ" is only available on the iPad.