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Intel Core Ultra 200V promises Arm-beating battery life without compatibility issues
(arstechnica.com)
This is a most excellent place for technology news and articles.
I think in terms of actually doing stuff AMD is close in terms of power draw (W/performance) but it's the little things like going to sleep and while completely idle that the entire MacBook draws so little power that needs to catch up -- and that's not entirely on the processor.