The jumping car used a 600L canister of 10 kPSI compressed air behind the seats. Musk claimed the car will be able to refill the canister itself, but he didn't demonstrate that. In reality, the size of a multistage compressor to reach those pressures and the heat dissipation for compressing that much air to 680 atmospheres makes that impractical and would use several times more energy than the batteries store. You would have to get filled up at whatever specialized system they used for the demo. The weight of the compressed air in that canister alone is over 750 pounds. It's a fun one-off trick, but I wouldn't worry about this showing up on an actual public road.