How to report facility Gas?

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This is actually an Output:Meter (or Output:Meter:XXX). It'll function the same, but this isn't the same object.

Example:

Output:Meter,
  NaturalGas:Facility,                    !- Key Name
  Timestep;                               !- Reporting Frequency
Output:Meter:MeterFileOnly,NaturalGas:Facility,Timestep;

You can take a look at the eplusout.mdd to find available meters for your simulation, provided you have added this object

Output:VariableDictionary,
  IDF,                                    !- Key Field
  Unsorted;                               !- Sort Option

For what it's worth, the same can be done in OpenStudio SDK (Ruby here):

include OpenStudio::Model
m = Model.new
o = OutputMeter.new(m)
o.setInstallLocationType("Facility".to_InstallLocationType)
o.setReportingFrequency("Timestep")
o.setFuelType("NaturalGas".to_FuelType)
o.setMeterFileOnly(false)