What kind of range do you see when you drive the e-tron like your merc?I get different ranges depending on recent driving histories. My favorite is seeing the guess-o-meter instantly drop from 157 miles range at the charging station to 125 miles when the next station is 120 miles down the road in the desert and it's 110 degrees out.
Well, it is an interesting dilemma. Many people feel it is based on your driving “style”, but I was having huge issues and it started just like that. One day it charges to w04 or even more, then gradually it was charging less and less. When I couldn’t get it to charge over 100 miles, no matter what level charger I used, or the duration, I brought it back to Audi 9where it has now been for a week and a half). Despite looking at the car on a number of occasions and deeming it fine, this latest visit found a faulty battery and two others out of synch. So there was an actual problem. Will be interesting to see how long it takes to repair...sorry for your trouble. Make sure all ancillary things like AC, seat heaters/cooling and heat are off during the charge. If it keeps up, I’d get it checked out before you lose faith in the car as I have.