@tourist in msn, over the years, I've learned a lot from you on this topic, and I want to express my gratitude. I bet others have learned from you, too. I haven't bike-toured in a long time though I hope to again one day. If I ever do, I'll be well informed about what to use and what not to use as well as what benefits I can expect from these gadgets. Dynamo hubs seem like an elegant solution, but I learned from you that you can really only expect an average of 2w of output. I usually use the Panasonic/Sanyo hub which has the most drag and vibration, but I don't mind, and it was inexpensive.

You mention a model of tire that is very draggy. As an experienced bike mechanic, I can fix flats without much trouble most of the time. I do not want puncture protection to drag me down at all. I even commute on Continental GP 5000 tires, though I may decide I've swung too much in that direction.

That article about hubs is great. I love stuff like that even if I'm not about to buy a hub.

There are now some breakthroughs that improve energy density of lithium batteries. I don't know if the cost will remain the same. That will make dynamos even less attractive than now.