The goal is simple, go as fast as you can.
Pace yourself, heading out at a pace you know you can sustain. Finish strong. Finish fast.
Head out fast, knowing you can run this fast. Finish fast. Finish with nothing left.
In the first example the risk is that you head out too slowly. Could you have gone faster today?
In the second example the risk is that you head out to fast. Could you have gone faster today?
Do you really know how fast you can go today?
The game you choose to play is up to you. It's your game. Play it the way that suits your personality. Either way it's risky business.