fwiw, I have a friend with an early 335d that I got some time on track in at NJ Motorsports Park. I was pleasantly surprised how torquey and fun it was. He eventually switched to something more track appropriate (Miata), but kept the diesel for DD use. Another drawback is the DEF systems in the newer diesel models (cars and trucks) make them more unnecessarily complex than they should be and more prone to needing repair which negates the mileage advantage. So I'm not convinced a newer diesel is the best way to go for a passenger car in the US. Truck, different story.
If your criteria includes making 200K, and are thinking new/fairly new, that pretty much works against most European and American makes as you probably don't want them that long without a warranty. That leaves Japanese and Korean marques for having more options. I agree with Jesda that Kia has some very compelling offerings.
I did a long drive in a CX-5 fwd base model a few months ago. Not bad at all, not sure about the back seat comfort but the front was okay. Pleasant car. If you're looking for a sedan, the 6 isn't bad either. If you're seeking new, you might check out the new Kia Stinger. Big sexy sedan that supposedly handles well. Looks very promising. I haven't been in one yet. If you're looking for a traditional reasonably comfortable roomy reliable SUV new or used to gobble miles, that you don't intend to ever take off road, I know Jesda might cringe, but a Toyota Highlander is not a bad choice. It's above average reliability track record cannot be ignored. Problem is that It's not exciting to an enthusiast, it's essentially a Camry underneath. If you do have off road fantasies, a 4 Runner might be better, but they're not as quite comfortable on really long road trips. I admit to having a 4 runner bias. I loved mine, and put a quarter million miles on it.
Something different to consider: old Crown Vic/Grand Marquis. dirt cheap, very comfortable for long trips, trunk can hold several dead hookers plus luggage, comparatively simple, you'll get an honest 20mpg, it's Rwd, and other drivers will still move over for you thinking you're a cop.