The Prius has an MSRP of $21,725. At 10% the cost of the car, the solar panel kit ($2,195) seems like a reasonable deal, considering it facilitates 10% better gas mileage. At 55 mpg, the gas cost to drive 200,000 miles (at $2.20/gallon) is $8,000. At 60 mpg, the gas cost to drive 200,000 miles (at $2.20/gallon) is $7,333. The difference is $666. Considering the kit costs over three times what the gas savings amount to, it is hard to market on account of good money-sense. The only consolation is the concept of helping mother nature. I have limited understanding of the fabrication process of the solar panels, so it would be hard to say whether or not mother nature profits from this scenario.
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