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is is making it more fuel efficient so the chemical stuff you can get a lot of instantaneous thrust but it's not very
fuel efficient it's much more fuel efficient to go with the electric type of propulsion um so that's where people spend a lot of their time
um is trying to make that more efficient in terms of thrust per unit of fuel and then um there's always considerations like
Listen to native speakers pronounce “fuel efficient” in real conversational contexts with synchronized timestamps and subtitles.