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There are trade-offs:
0-20/30W gets to surfaces faster on startup. Including cylinder walls and behind rings. That's where most of the engine wear occurs to my understanding. It has lower viscosity and a lower total load to pump through an engine so should be better MPG.
It does not remain on surfaces as a thick film for a long time in crevices at critical points. It will not hold a surface as well under heavy torque.
I did put 5-30W in a Prius Atkinson cycle with 0-30W recommendation which 'sounded' louder to me at startup idle, and quickly changed back.
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Meanwhile other things are still happening.
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