Poking around, on the Lithium-air battery wiki page, they have this quote:

> The energy density of gasoline is approximately 13 kW·h/kg, which corresponds to 1.7 kW·h/kg of energy provided to the wheels after losses.

Any clue what the energy provided to the wheels is for electric cars like a Tesla? I'm wonder what the energy loss is for electric cars from stored form to actual power at the wheel.