[RedDevil]

While I reduce speed for a long green up ahead, there are lights I maintain speed towards when they are red - like those that have a fixed pattern of servicing the traffic directions, and I see cars crossing from the direction that gets green prior to my lane.
When it has just gone green and I can join up with the line of cars before the last car passed the lights I'll do that. Otherwise I coast.

When you know the pattern or traffic situation then you can work out when to brake and when to maintain speed.
If you do not know the pattern then you have to decide what you value most - time or fuel efficiency.
If missing a green you could have had worries you more than wasting fuel then maintain speed while it is still green. Otherwise coast towards the lights.