Why don't you buy a TDI VW with a stick? If you are on the road a lot, it sounds like freeway driving. Will be very efficient. And it rides nice. And you like diesels.
I asked the BMW question several times 5 different ways on here and always get the same answer. I do respect the wisdom of this board, so I have refrained from BMWs.
Even if you have the patience to deal with issues, it is time away from fun things and or / time dealing with the shop, appointments and loaner vehicles.
G