Depressing throttle twice

[westo3]

Was having a test drive in a Lexus GS 300h the other day, we were driving along at about 60/70 mph at around 2000revs (sport mode) when the sales rep switched the drive mode (although I am not too sure which mode) then told me to depress the throttle twice the engine revs dropped and he switched it back into sport mode and the revs were showing 1000 but we were still going the same speed. Has any one come across this and if so what mode do you have to be in to achieve this.

[Zotto]

May be you have some confusion about HSD , probably the salesman wanted to show you that once you have reached the selected speed you can keep it at very low rpm.