Chain tension and tensioning a chain

Most of my chainrings are alu.
It's heat-treated and hardened but it stills wears quicker than steel rings.
It's not like you swap them every ride.

Whilst no physics expert, a tight as possible chain means extra friction. Extra friction means wasted energy.

Perfecto..

is that you? or is that an example of perfection? (or in your opinion, both)

just wondering as you claim not to be a physicist but the dude in the pic has a 'science in sport' top on...how coincidental