You may find this write up of the engine interesting:
www.libralato.co.uk/docs/Libralato_Engine_Technical_Summary.pdf
Unfortunately the description does not include the BSFC or compare the Atkinson cycle, piston engine in the graph. A minor point but I get a little anxious when someone claims "50% efficiency" without providing a traditional BSFC chart.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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