Engine Anti-ice burns 90 kg per hour.
Engine + Wing Anti-ice burns 250 kg per hour.
Compared to 2 Engine LRC at Optimum Altitude for any given weight:
Engine Out LRC burns 21% more fuel.
Engine Out LRC increases Time Interval by 13%.
Depressurised LRC (2 Engines@10,000') burns 49% more fuel.
Depressurised LRC increases Time Interval by 20%.
Gear Down burns 89% more fuel!
Gear Down increases Time Interval by 29%.
Hint. you can check the Depressurised figures quoted above by entering 10,000' as a "step altitude" in the CRZ page and compare the fuel remaining at your destination.