Ok , let's calculate, this Bortone cycle has 6 times the power strokes that a normal IC piston engine has. An IC piston engine has a power stroke at every other engine cycle, so at 3000 rpm it fires only 1500 times. Acccording to the information given, the new engine will fire 9000 times at 3000 rpm. So where is the fuel efficiency ? Sure, jet engines have an efficiency of about 70% compared to the 20% of the IC piston engine. YET, they will still use more fuel if used to power a car instead of a plane. For instance, the turbine engine cars built by FORD, GM and FIAT etc., had very good efficiency but they still used about 8 times the fuel of an IC piston engine. That's why theu never caught on.