# 9.6 Cruise Performance

### Typical Cruise Envelope

- Altitude: **FL320 – FL390**
- Speed: **Mach 0.76 – 0.80**

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</div>### Efficiency Considerations

- Higher altitude → lower fuel burn
- Managed speed → optimal performance

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</div>### Monitoring Requirements

Pilots must monitor:

- Fuel consumption
- Wind conditions
- Flight progress

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</div>### Core Rule

**“Cruise is about efficiency, not speed.”**