IamIan's comment prompted me to calculate the benefit in another way. Based on charging the battery with a max of 840Wh everynight and using a DoE rating of 220-265wH per mile this would mean about a max of 3 miles of additional electrical range per day. Depending on your daily driving habits this could be a lot or could be a little. Is it worthwhile? Good question, both in terms of the financial investment, and time to plug it in everynight to get 3 additional miles without needing to burn gas from the tank. I think the answer is different for each owner.
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