Have you calculated gas savings yet? When I switched my wife from a mini-van to a Model S, it's been saving us almost $300 per month in gas (net, after subtracting electricity - she drives 2000/month). Also, if she has reservations about internal space, the Model S is almost the same size as a Toyota Sienna, just not as tall. We've hauled 10ft pipes in it, 100" table, a queen bed, etc - my wife's concerns about how much she can haul disappeared, and did I mention she now loves the Model S and would not give it up anymore? Be careful letting her drive it, you may end up driving her car instead.