What is the principle of Civic ECON's one-click fuel saving?

Civic ECON's one-button fuel saving principle is to correct the fuel waste caused by the driver's misoperation by correcting the throttle opening of the engine by computer. This function needs to be turned on by pressing the function key. The specific operation steps are as follows:

First, open the door of Civic cab. ?

Second, step on the brake pedal of Civic.

Third, press the one-button start button of Civic to start the engine. ?

Fourth, the dashboard lights up, which proves that Civic's engine has started. ?

5. Press the ECON key of Civic to start the fuel-saving mode.