> Musk isn't correct though, or maybe you misunderstood or misquoted him. Higher speed is only more efficient if the craft itself moves at a higher speed. He'

> Musk isn't correct though, or maybe you misunderstood or misquoted him. Higher speed is only more efficient if the craft itself moves at a higher speed. He's got it completely backwards from what Musk said in that interview, see my reply.