How much power saves 5V 1A router compared to 12V 2A (in real life)?

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You may find this thread with a table listing actual power usage numbers for several devices interesting:

Power consumption of routers and associated networking equipment [collection]

This thread is intended to collect information about power consumption by OpenWrt routers as well as associated network equipment. Depending on the measurement devices available anything from immediate power (Watt) to energy (Joule or Watt Second) is fair game. NOTE: This post should be editable by all, please feel free to add your own numbers to the table To make a start (? denotes "missing"/not measured values): type ; device ; energy/h; min_power; max_power…

EDIT: I hope that anyone that measures their power usage per device will contribute to the table in that thread. I plan to after updating to 23.05.4.