6 panels at .19 capacity is what, .4kwh? So call it 2 miles of driving for each hour if we're generous, and with 8760 hours in a year, that's 16,000ish miles a year. Unfortunately it'll cost you about 4,500 to have the system installed, quite a lot more than the initial 2k estimate. Your price per mile is more like 6 cents per mile, which is about on part with most sedans that get ~35-40mpg, and they cost tens of thousands of dollars less than your solar car that you conveniently forgot to include in your pricing. Electric cars take decade to pay off as is lol. They're not efficient for your wallet, they're clean-ish compared to gas, don't think otherwise.