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How much money has stayed in the US...

because of

  1. Tesla/Model S purchases (vs the prior high-end sedan purchases which were largely from overseas manufacturers)
  2. Tesla/Model S "miles" (fueled by 100% domestic fuel vs say 50% domestic petroleum)

i.e., Savings from difficult-to-quantify environmental, health and other benefits aside, the financial benefits from the above fact(or)s alone might justify not only the federal and state incentives, but possibly some of the sales of ZEV credits that nay-sayers and haters love to cite.

Someone else might be able to provide a finer analysis (or discredit this notion completely!), but here's my very rough and 'round numbers' analysis:

  1. Let's say 40k units at $75k each = $3bn; very generously, $1bn would have gone to the Big 3 in Detroit (stayed in country) anyhow, meaning $2,000,000,000 stayed in the states. Federal tax incentives on those vehicles? = 40k x $7.5k = $300mm, for a roughly 7:1 "return" or benefit to the U.S. economy.
  2. Say 600 million (? is there a counter somewhere? :) ) miles, = 20,000,000 gallons @ $3.00 / gallon, half of which would have left the country... resulting in $30,000,000 that has stayed in the US economy from petroleum "non-expenditures" alone.
So where does that leave us? Well over $600 million per year is staying in the US because of the Model S. And even if most of it weren't going toward well-paying jobs in the all-important "STEM sector", I think that would be a good thing. No?

I haven't seen this point spelled out anywhere before, so thought I'd try it here.
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That is one of my major points about driving an EV. The energy is produced locally. It might be not 100% clean, but the advantage of avoiding all the problems that come with oil which are so bad. I'm not sure about the numbers. One could argue that many of the parts are sourced from overseas or at least are made partly in other countries. But exact numbers are not so important. There are a lot of very important advantages to produce local and use local energy.
I just realized that I used the global number (estimate) of miles driven in #2 above, not a U.S. number. Still, that's the smaller of the two numbers (by a lot), and "over $600 million" in savings per year still applies. However, the number of U.S. miles per vehicle can only go up (until its unfortunate demise) and gasoline prices trend upwards, so I'm sure that the cumulative savings of "category 2" above will continue to go up and slowly become a bigger 'piece of the (apple) pie', as well.
I like your #1. Good point. If subsidies help a burgeoning industry take hold that both helps our economy AND the environment, I'm all for it. I wish we would use taxed and subsidies to cure the climate change problems we face - make it not illegal to pollute, but expensive. Make it not only easy to go solar/buy an EV, but cheaper.