gas usage

- sensor:
  - name: 'Gas Usage'
    state: >
      {% if states("input_number.gas_meter_pulses_count") == "unknown" %}
        {{ states("sensor.gas_usage") }}
      {% else %}
        {{ (states("input_number.gas_meter_pulses_count")|float)/100 + (states("input_number.gas_initial_usage"))|float }}
      {% endif %}
    unit_of_measurement: m³
    device_class: gas
    state_class: total_increasing