What is the EA rate with the $4/month subscription fees? In Minnesota, EA charges $.31/KWH. Tesla charges $0.46/KWH peak and $0.23/KWH non-peak.
I know in some states, the rate is by the minutes and not KWH. In Wisconsin, EA charging rate is $0.24/Minute (1-350KW). It is is very attractive for Tesla's since Tesla can charge at over 250KW at the low state of charge (20%), That means you will get 4KWH per minute at 250KW for $0.24 ($.06/KWH equivalent).
It seems that in Minnesota with $/KWH, Tesla Superchargers is cheaper (at non-peak) than EA. Would you please share the info in your area? I can see that the EA adapter will provide the convenice and charging flexibility. I am not sure it is cheapter to charge Tesla's at EA on a regular basis though.