Capstone hides their fuel specific pretty well, but you can tease it
out. .57 lb/hp/hr. Very good for a small turbine with a single stage
compressor - but even an awful 4 stroke piston engine should be about
..45. A serious stratified charge engine can get down around .33. I
think the record is about .25.

The Capstone uses some very clever air bearings, but they won't stand
up to any gyroscopic force. Put them in an airplane and try to turn,
you'll crash the bearings.