http://equideus.com/ (http://equideus.com/) http://equideus.free.fr/moteur_pneumatique.php (http://equideus.free.fr/moteur_pneumatique.php)
0,7 - 1 Kg Propan or Butan for 100 Kilometer drive ( Butanol 1 Kg~ 13 KWh)
Instead Propran/Butan Hydrogen ? 1 Kg Hydrogen ~ 37,58 KWh
http://judbarovski.blogspot.com/2018/09/hydrogen-by-usd-01kg-is-possible.html?m=1
Compressed air Gen-set
https://worldwide.espacenet.com/publicationDetails/description?CC=US&NR=2013038069A1&KC=A1&FT=D&ND=&date=20130214&DB=&locale=# (https://worldwide.espacenet.com/publicationDetails/description?CC=US&NR=2013038069A1&KC=A1&FT=D&ND=&date=20130214&DB=&locale=#)
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To compare:
http://www.engineair.com.au/index.php?option=com_content&view=article&id=2 (http://www.engineair.com.au/index.php?option=com_content&view=article&id=2)
Up to 94,5% efficiency Only 1 PSI of pressure is needed to overcome the friction
http://www.thefuture.net.nz/engine.htm (http://www.thefuture.net.nz/engine.htm)
writing about 70% efficiency
Dr. Melvin Prueitts ( R. I. P.) M. E. C. H.
https://contest.techbriefs.com/2012/entries/machinery-and-equipment/2491 (https://contest.techbriefs.com/2012/entries/machinery-and-equipment/2491)
"... The MECH expander required only 1 PSI to keep it running. ...."