I sent the following to the Supercharger group at Tesla Motors...
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I am a Model S owner (delivery Nov 16, 2013) located in Tucson AZ. I am very pleased to see the rapid rollout of Supercharger capability in my state. Thank you!
In looking over the projected 2015 Supercharger map on the Tesla website, I see a long gap between Superchargers on I-10 between Phoenix AZ and New Mexico. I infer that the one south of Phoenix is near the junction of I-8 and I-10 near Casa Grande AZ. The one in New Mexico is probably near Lordsburg NM, the westernmost town in NM on I-10 and the closest spot to AZ that might have the electrical infrastructure to support a Supercharger.
The distance from Casa Grande AZ to Lordsburg NM is 224 miles according to Google maps, which is a stretch in an 85 and not do-able in a 60.
My suggestion is to consider siting a Supercharger in the vicinity of Benson AZ. This almost exactly splits the distance: Casa Grande to Benson is 115 miles, Benson to Lordsburg is 109 miles.
In addition to the primary goal of facilitating travel along I-10, this also opens up much of southeast Arizona for Model S owners: Tombstone, Bisbee, Willcox, Sierra Vista and perhaps the Chiricahuas.
Note that Benson is a small town, far enough from Tucson that no one will try to use it for local driving, yet interesting enough for a stop.
Thank you for considering this suggestion.
I applaud your efforts to revolutionize personal transportation by making inter-city travel practical -- and fun!