Yes the revving and speed are not matched as the ICE motor is normally generating electricity, that flows to the battery and even when the battery shows 0 there is a significant buffer so the electric motor has plenty of power. So it very rare when you are on gas only and if it happens you will know it. As the ICE is about 75 HP but the electric motor is like 230 HP. So if/when the battery is empty the car is noticeably slower, very noticeably.Thanks. This is surprising to me. My sense was the car goes way slower when in gasoline only mode, than it does when the car has gas in the tank and battery power. Maybe it's the engine revving sound that makes it "feel" sluggish.