I have never driven any 2-wheeler so can't comment on that.
However, I have noticed that in buses, if the driver simply lifts foot of the accelerator (say ~60 km/h), the bus immediately slows down. It is quite natual, as the accelerator is releases, the engine rev falls, so torque produced drops - the engine can no longer develop enough power to pull the vehicle, so it slows down.
In cars, I think it depends on tuning of the engine. If your car is tuned in a way that it loses RPM faster when accelerator is released, more engine braking will result.
__________________ Gearbox acts as torque multiplier. |