Turns out you really can charge a Tesla from a Lightning ⚡

[Maquis]

Assuming long range battery, 81kWh capacity, 47% is roughly 38kWh. On a ER lightning, that's about 29%.

You’re going to lose about 10% on each conversion, so I’d expect to see closer to a 35% hit.

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[Zprime29]

Good point, I bet when the OP tests more thoroughly we'll see closer to your number.