Mine was built February 3rd, battery pack is "F", but was told at delivery it couldn't be updated. Would love to know what, exactly, makes mine built months later unable to be a Plus model. Have accepted that (as required at delivery), but still irksome not knowing what it is or what real world difference this unknown component I'm missing makes.
Haven't done a road trip yet to know what average Wh/mi is at highway speeds, but in my regular stop and go driving on 45 MPH roads around here (if I can stay off that joyous acceleration), I do get ~24x Wh/mi which would be up in that 390+ mile range on the 97.6 kWh pack.