I suppose I was lucky to find some dealerships in the GTA that had e-trons available for test drives.
First off - the e-tron is a fabulous car. I've had mine over 14 months now and I still love driving it.
My overall fuel consumption is around 3L/100 km (I have over 34,000 km on the odo).
I can't answer your questions (1 to 3), at least not from personal experience. I have spoken to other e-tron owners one who had a bike rack on the back of her car.
I would suggest visiting
www.speakev.com and pose your questions on that site. It's a European site and they've had the e-trons a lot longer with many more owners who might be able to provide you with answers.
This was my 1st new Audi and I've had no major issues with it. I have experienced a gremlin with the B&O system. But it's been rare and hasn't reoccurred in a long time.
If you are going with a PHEV or even BEV (if that's a possibility), make sure you can get a 240v plug somewhere accessible for charging at home.