A: When my Tesla is charged from my solar panels (which generate electricity at about 8c per kWh) I can drive for 2c per mile. A gasoline-powered car getting 30 mpg on gas at $3 a gallon costs 10c per mile. It is 80% cheaper to drive on solar power than on gasoline! And that is without even mentioning the zero-carbon footprint of driving my Tesla on solar power.