I scanned the first page of
duckduckgo.com/?q=thermal+eficiency+piston+engine+vs+turbine&ia=w eb.
It appears diesel ship engines approach 50%, but piston engines scale down more favorably [compared to a turbine]. So ¯\_(ツ)_/¯
I'm more interested in
duckduckgo.com/?q=solar+cell+100%25+efficient&ia=web
Quote:
https://intivation.nl › solar-cell-with-100-efficiency
Solar cell with 100% efficiency - Intivation, developing ...
Solar cell with 100% efficiency Engadget reports today that scientists have discovered a way to produce solar cells that can capture 100% of the energy contained in the sunlight that reached them: Researchers over at the National Renewable Energy Lab have reportedly made the first solar cell with an external quantum efficiency over 100 percent.
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Nanoscale quantum dot metamaterials make it happen.
edit:
In my youth I ran a mile in 5:15 in combat boots. And that with a deviated septum.