Simple,

To break-in the new engine, just drive as you will normally drive lah..
If you are a fast and furious driver, then drive it hard.
If you are a slow and steady driver, then drive it slow and steady.

No need to drive it hard but in actual fact you will only drive it slow.
No need to be so gentle if you like to press the pedal to the metal.

New car and still in warranty right? then by all means drive it hard.. any problems just get back to SC and claim.. hahahha.