I read it differently.....
"ECO-THROTTLE (TM) SWITCH
The Eco-ThrottleTM system automatically reduces engine speed when all loads are turned off or disconnected. When appliances are turned on or reconnected, the engine returns to the proper speed to power the electrical load.
If high electrical loads are connected simultaneously, turn the Eco- Throttle switch to the OFF position to reduce voltage changes. When using the DC output, turn the Eco-Throttle switch to the OFF position.
ON: Recommended to minimize fuel consumption and further reduce noise levels when no load is applied to the generator.
OFF: The Eco-Throttle system does not operate."
Bob