Your wife drives a lot -- the gas savings on an electric car are likely to be more than $20,000 / year. You don't drive outside the range of the car -- so there's no practical downside to the car. You are the ideal market for the Tesla Model S.
Yes, you need to keep a cash cushion in case of emergencies. If you're uncomfortable with reducing your cash level, then finance the car while keeping enough cash to pay off the loan at any time. Essentially you'll be paying interest in order to have a larger cash cushion.
Alternatively, if you have the ability, you may wish to find a way to get access to a low-interest-rate line of credit by some other means; if you have a lot of stocks you can often get good rates on margin loans, for instance. You wouldn't plan to *use* the credit, but it would be an alternative to holding lots of cash in case of emergencies.
I will say this: if you're concerned about economics, skip a bunch of the options. Don't get "Performance". Get the cheapest 19" wheels. The 85 battery is likely to be worth it if you need to drive long distances. Everyone loves the tech package. I still think dual chargers ("high power home charging") are worth it, though possibly not if you plan to stay in California all the time. Air suspension, parking sensors, and fog lamps may be useful to you or may not be. The rest of the options are mostly cosmetic, and they're *expensive* cosmetic options, so you can cut the final price down a lot by avoiding them. With California tax incentives, you can keep the final out-the-door price below $90,000.