Antdun,
I love your project and I do think solar and a leaf go great together but I wouldn't use the gas savings money in your calculations unless you add the cost of the car to your initial capital investment.
If you already have a gas car, are you selling it? What is it worth? How much for a leaf that you like. Maybe the one for $6k came from Houston (flooded) and you really don't want that. Who knows.
What I'm saying is, you are taking parts of a picture and now the whole picture. If you start using the benefits of the leaf in your calculation, then you need to use all the numbers from the leaf and sale of your old car. Also, as you said, I would add in the cost of oil changes from your old car. Finally, is there a difference in insurance cost between your old car and the leaf?
Again, great project.
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