Yesterday we rode about 45km (28miles) though forests lots of uphill, even though clover meadows and the GT16 handled that superb (I on my Kingsong KS18 thought I can go back to my girlfriends GT16 and and carry it about 300 meters, but it wasn't so ) The distance from the pedals to the ground is nice and we handled every terrain without any problems.
We had comfortably overtaken a few cyclists. ? I guess our average speed was about 22km/h (the uneven terrain in the forest lowered the average speed) but we rode on even terrain with a average speed of about 30-34km/h.
At the end of the journey the battery of the GT16 was reaching about 18-15%. There is also a low battery/voltage warning integrated which is very nice! Which means if you are accelerating harder it is "beeping" so it keeps you aware from accelerating or going faster. By keeping the battery SOC in mind we had about 1,5km left and rode comfortably with a speed of about 25km/h until we reached our destination.
We are very satisfied with the behaviour overall and I guess if we ride the GT16 mainly on flat terrains I guess we can go easily 55-60km (34-37 miles)...
One last point is the mainboard temperature. At the end of the ride I checked in the app and it was showing 40 degrees Celsius which is pretty cool. (My Kingsong was showing 50 degrees.)