Honda EB6500 Owner's Manual page 20

Auto-throttle system
With the switch in the AUTO position, engine speed is automatically
reduced to an idle when all loads are turned off or disconnected. When
appliances are turned on or reconnected, the engine resumes the rated
speed. At OFF, the auto-throttle system does not operate.
NOTE:
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AUTO is recommended to minimize fuel consumption when no load is
applied.
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The auto-throttle system will not respond to electrical loads of less than
1 ampere.
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The system is not-effective for use with appliances that require only
momentary power. To avoid extended warm-up periods, keep the
switch OFF until the engine reaches operating temperature.
AUTO-THROTTL
SWITCH
18