I will recommend you this : try to keep the instant consumption on the highway around 20 kW. If it is lower, it is even better. The battery is 60 kWh so... if going 60 mph is asking for 20 kW or less, you can then run without a problem 160 - 170 miles to reach the next DCFC charger. If you know the distance between the DCFC, you can very well predict the speed you should use based on the instant consumption. If you can lookup the elevation of the trip, it’s even better. As a rule of thumb, always start with a lower speed to see where you are with the consumption, then when you see that you can make it with a buffer, increase the speed and try to arrive at the DCFC at 15-20% SOC.