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Very few motorcycles run on propane...
...but I'm sure someone will think it's a great idea. But propane under pressure enters the liquid state to a great extent and dissipates rapidly when released; propane tanks don't have to be nearly as stout as compressed air tanks. Air stays gaseous unless placed under extremely, hazardously high pressure and places its container under constant strain.
Posted by loupgarous
15th Jan 2012