90 miles is pretty incredible. I have occasionally looked into ebikes, thinking that there are days when I'd like to get to work and not be a sweaty mess. I feel like I would never find an acceptable range. Usually around 30 miles seems standard. That's more than enough to get me to work and back, but it wouldn't take too many detours before I ran out of juice and had to pedal a bike that was twice as heavy as it needed to be. For touring? Forget about it. 30 miles a day is nothing, and then how can you be sure you'll be able to charge it.
But 90 miles a day. I could work with that. Although I can't imagine touring on an ebike. I could imagine a fancy, enclosed bike like the ELF for getting to work or elsewhere in bad weather.