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Both of those were measured by Friction Facts so you can find out how much cross-chaining and how much lube choice is impacting watts.
"Muc-Off now sells its Nano Chain to the consumer, which it claims can save up to 6 watts in drivetrain efficiency over a standard chain, for upwards of £122.
Meanwhile Danish company CeramicSpeed’s data says 2-5 watts — around 15 seconds over 40km — for its UFO chain, which costs £113."
For me it's not about watts, I already have a Ceramic Speed chain. It's more about increasing component life and keeping the flat cleaner.
Have you tried full on waxing?