The eco-throttle mechanism automatically controls the engine rpm according to the load of the device(s) being used. This mechanism reduces fuel consumption by 20% or more and achieves a noise level that is the lowest in this class.

Eco-throttle (load-dependant speed-control-type electronic governor)
This load-dependent speed-control-type electronic governor automatically controls engine speed to best fit load. This allows for effective engine control when supplying power to equipment requiring large amounts of electric power upon start-up. This translates in not only reduced noise and fuel consumption, but also in extended continuous operation capability. The eco-throttle governor also contributes to reduced exhaust emissions.

Honda's Eco Throttle system is standard on the Honda EU10i , EU20i, EU30iS, EU30i, EU65iS and EM65iS.