Very interesting order guide. The Extended Range battery says 88 kwh usable so it looks like they have walled off 10% of the battery if the original 98.8 kwh info is still accurate.I was at the dealership today. He gave me several pages of information. Three pages are attached. there was a discussion re the Sound System - B&O system is standard.
www.macheclub.com/site/threads/2021-mach-e-mustang-order-guide.877/11 additional pages of the guide are available here (remove the spaces in this link): www. macheforum .com/site/threads/2021-mach-e-mustang-order-guide.877/