After a few requests I got for loading the aircraft for use with career trackers (FSEconomy, FSCharter, etc), I did some changes to allow control fuel and payload via X-Plane's menus. This is a short fix, not an update.
Download the file below.
Backup your P180_Avanti_II/scripts folder, and delete it from Avanti's folder.
Unzip the downloaded file and move the new scripts folder into Avanti's folder.
Download here!
FUTURE UPDATES:
After X-Plane 12 will be released, and do what needed for the payware products (C23, DC3), I will bring Avanti up to XP12 standards, hopefully sometime within 2022.