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That will be a long long time coming. Gasoline is about 46 MJ/KG or 34 MJ/L. The best lithium-metal batteries are about 2 MJ/KG or 5 MJ/L. The best lithium-ion batteries, about half that. Gasoline is extremely energy dense. For a comparison, TNT is only 5 MJ/KG and 7 MJ/L.

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Fortunately, gasoline cars are so inefficient that you only need about 1/3 of the comparable energy in an electric car to move the vehicle. Still a ways to go, but we don't need to get to all the way gasoline energy density for the equivalent range.

ICE efficiency brings that down a decent amount, no? 35-40% at best. The fuel is much more dense, but converting it is not as efficient.

Especially in an older car with a less efficient engine.

> ICE efficiency brings that down a decent amount, no?

In terms of power to the wheels, yes. Some of that latent energy can be useful, especially after it's converted into heat.

Roughly 15-20% during actual driving.

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