I am driving in heavy traffic. The slower the traffic, the better range you get. I daily drive to school for pick n drop and the traffic there's worse. While the ICE vehicles burn more fuel idling or when driven under 40 kph, I enjoy better range in such situations and almost negligible energy consumption when idling (without AC or heater). The AC takes 1 kW power when turned on which is still very less compared to idling with ICE car.
Like Uzair mentioned, 300~330 km is good range because the claimed range for 49 kWh battery pack version is 345 km (WLTP).
As far as I have researched, EV range gets worse when driven at motorway speeds. Even though I have not taken my Atto to motorway but IMO it will give range between 200~250 km when driven at 120 kph.