As someone who has driven a 60 (essentially same range as a base model 3) on the supercharger network quite a bit, I can say that 150 miles between chargers would routinely be a problem for a base model 3, as well as for a 60 kWh model S. Not only would it require a full range charge at each station to give sufficient margin, things like a cold or hot day, higher speed limit, elevation change, passengers or cargo, or battery degradation can eat into that margin quickly. A 60 or base 3 could do a 150 mile leg, but it would require 90-120 minute supercharges, and would require the driver to be very conscious of his energy usage the entire time. I think that Tesla needs to shoot for 100-125 miles between chargers for the base model 3.