If there is one thing Tesla is famous for it is their battery life expectancy...
It really depends a lot on the input electricity price too, not just the gas price
Specifically, in San Francisco and parts of Europe, the cost of electricity is high enough, or approaching it, that it's not actually cheaper to pay for electricity instead of gasoline.
Somewhere in the neighborhood of $0.70/kWh vs $5/gallon of gas, someone else can go deeper into the math.