How can I get an efficiency report for my circuit?
You need to add the keyword "steady" steady to the .tran command, e.g., ".TRAN <time> steady". The program will detect the steady state by checking the internal state of the switcher macromodel. It doesn't work when a switching regulator part is not part of the circuit because the steady state detection is implemented in the model -- usually by looking for the the current flowing out of the error amplifier to drop to zero as integrated over a switching cycle. There must be exactly one voltage source in the circuit. This will be identified as the input. There must be exactly one current source in the circuit, though a resistor with the name of Rload can be used instead. This will be identified as the load. After the simulation is done, you can select the 'Efficiency Report' under the 'View' menu to see the report on the schematic.