105,500 on a new GL1800A. I only parted with it due to the weight and my bad back, BUT I do miss it and have been toying with going back to one. The only major issue in those miles was at 85,000 the complete stator & regulator bought the farm, I was on a extended 7 year maint program and it cost me nothing for the repair and dealer came and rescued me 150 miles from his shop.
If you get a GL 1800 I highly recommend that you only consider a ABS bike! If it has ovr 50,000 I also recommend that you seriously consider a Traxion upgrade to the suspension system, with that in place you can stay right with anyone on a stock suspensioned NT in any set of twisiies he wants to choose. I had a Rich Oconnor seat rebuild and that was from the 5500 mile point onward. With the wing you can easily add 4 to 4 1/2 gallons of AUX fuel if you choose to do so. It also is a trailer towing with out a problem . I pulled a Kwik Kamp tent trailer probably 30 plus thousand miles, I also did a number of serious LD rides including a BBG, 1500 miles in under 24 hours and I still felt like partying afterwards! If you chose to go dark side the GW will accept several different Fun Flat car tires with out any problem. As I set here thinking about all of this , not to mention Radio & CB communication and reverse I wish I still had my 04, I see it occasionally , I have not talked to the new owner, but I would imagine he has 150 - K or more on it by now. If you get one in the 80K plus I would do a valve inspection on itas you wont know how it was ridden, nor how regular the oil & filter were changed, nor what oil was ran in it. Mine was changed at 3 to 4,000 miles and had Honda SYN in it from the 20,000 mile pointMy vlaves were checked by me at 85,000 and still were well with-in spec and not any at the marginal tolerance. I have been around where others were checked and some found them dangerously close to being too tight, but I didn't know the ride history , nor oil history. One minor item that I did have to deal with , acturally my dealer wrench as I said I was under a 7 year unlimited mile maintenance program. the coolant hoses clamps had a habit of loosening up and a antifreeze oder would happen, the tech relocated the position of the clamps so he could access them with out major work to retighten them. A Wind Bender winshield is also a very nice addition. I had to replace one saddle bag lid lock devise, the spring steel thing broke, but it was a 5 minut repair job, otherwise there were no saddlebag lid problems. Like the NT, the wing will run on most any fuel that is available, but where the NT will give you 50 to 65, or 40 MPG if you are really pushing it, the wing wont do much better than 42 or 43 and if you are really pushing it the MPG can drop to around 28-30.