First off Gary, I think a person's weight may be the 2nd biggest factor when it comes to highway performance. If you don't weigh much you may be able to hold 70 miles an hour, not comfortably, but it might do it.
I have had mine up to 70, but that was on a slight decline and it was pretty much all it had. It will hold around 55 to 60 on a mild to moderate incline, as long as the wind is not working against you, but it will be screaming. That being said, I am in the ballpark of 255 lbs. If someone was around 180 or less, I do think it would be able to cruise around at least 60 to 65 mph semi comfortably.
The bike seems to do pretty well on oil roads and old mining roads. It can also handle basic ATV trails pretty good, but I would recommend more aggressive tires like the Yamaha TW200 has if you're going to try to take it on anything more than that. It's also not horrible in the snow offroad, but I would not recommend taking it on hard packed snow on the street.
Hope this helped at least a little.
Last edited by EtniesFreak; 05-05-2019 at 01:59 PM.