Most power efficient mainboard at idle?

My 11th gen framework has never had stellar battery life. I’m looking to make an upgrade of some kind. I want to know the power draw at idle of various cpus, but I can’t seem to find this information anywhere. Does anyone know of a place where I can find comparisons of idle power draw for different cpus/mainboards?

https://www.notebookcheck.net/Framework-Laptop-13-5-Ryzen-7-7840U-review-So-much-better-than-the-Intel-version.756613.0.html

The power consumption and battery life sections have comparisons to other gens. I think its hard to beat the value of a 7640u mainboard.

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