Checking Strava, 17mph average speed. That includes a few miles with a depleted battery. Probably 70% of the loop is unpaved farm roads though, which tend to be washboarded and potholed and not conducive to high speed cruising. On my normal gravel rig I average 11-12mph on the same loop.
Top speed on the loop was 32mph.
If your goal is a good range while cruising at high speed, I'd likely look elsewhere (at least until the extender comes out). On shorter loops, I'll often ramp the assist up once I hit the road back to town, and its totally capable of cruising at high speeds, but the hit to battery is immense (I'm not sure even a more ebike-standard 500whr battery is gonna get you a lot of range at 28mph).
I just finished a 28 mile loop and had a car pull up at the light near my house and congratulate me on holding the 25mph speed limit the whole way back to town.
Those 2-3 miles cost like 15% of the battery though.