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You can use a Tesla on the grid, and potentially see quicker ROI, depending on your local per-kW rate.

It would lengthen it for me. I buy cheap subcompacts with good gas mileage. My total cost (annually) for fuel is ~$1k at which point the gas is basically free due to the $12k price difference.

The cost difference between an electric car and a cheap compact car is so high that it pays to fuel the compact car for 100,000 miles +.

That's an impossible question to answer without running real numbers. It might be cheaper to buy the gasoline (or electricity). Or not.