Having been raised with the Metric system I tend to think in km rather than miles. So the ranges of the batteries Tesla has discussed are:
160 Mi = 257.5km
So the two longest trips I make on a regular basis are weekend trips to the family cottage (about 360km each way) and a couple times per year I drive between Toronto, ON and Charlotte, NC (~1250km).
Clearly the longer trip requires ICE, train or plane. Doing it in an electric car would still be workable, but I can't tackle it in one day (like I do now with my TDI).
According to http://www.teslamotors.com/blog/roadster-efficiency-and-range I should be able to get ~170Wh/km at ~100km/h (35km/h should be about 87Wh/km).
What I am concerned with is the viability of the cottage trip. A Roadster can't make it without charging (53kwh / 170Wh = 311.7km if you go full to drained which is bad for the battery). If we assume for a moment that the heavier, but more aerodynamic, Model S will have the same energy consumption as the Roadster (based on statements I have seen from Tesla and taken quite literally here) the max ranges on the highway (100-105km/h) would be:
The numbers above don't take into account the small annual loss of capacity that occurs.
My parents live about 1/3 of the way from Toronto to the cottage. I haven't asked yet, but I assume I could add a charger in their garage (as long as I pay for it). How viable would it be to:
-pack and charge the car before I leave for work on Friday
-drive 30km to work
-after work drive to my parents' house (about 125km from work) to top up the charge and make (or order) dinner. How long would this charge need to be? I need to leave their garage with 240km of highway speed range (min 83% on the mid-size battery and 63% on the largest)
-finish the drive and then plug into an ext. cord at the cottage to spend the weekend charging.
-On Sunday night I would also stop at my parent's house to recharge for a bit before continuing on.
I make this trip about 15 times per summer (average 4 long weekends and 11 regular weekends). Rental cars would add up to about $2350 per year (assumes HST (Harmonized Sales Tax), a frequent renter discount and 60L of gasoline at $1.15/liter).
Regardless of the selected battery pack I might want to look into the viability of getting a real charger for the cottage. Without one I would be running a 30m (100') ext cord back to the building to grab standard 120V/15A power. Charging that way would be Very slow.
By the time I take delivery of my Model S my TDI will be 13 years old. Maybe this is incentive to keep it on the road until the annual repair costs get out of hand. However, I have no interest in owning 2 cars.