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Adding solar can work - the Hyundai we talked about earlier is a perfect example of the use case. Running the numbers:
50 mpg @ $3.00 per gallon = $0.06 per mile
Hyundai says in perfect conditions you will get 808 miles of solar driving per year saving $48.48.
I would much rather have a solar roof than a useless moonroof which saves me zero dollars a day and will leak given time. It is conceivable that a solar roof could pay for itself in maybe 10 years in perfect conditions but more realistically 15 - 20 in typical conditions.
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