If there is a red traffic light in sight and traffic allows: release the accelerator and roll slowly. Chances are the light will switch to green and you can proceed without stopping.
Avoiding full stops is also the goal before roundabouts and exits, in situations where you have to yield to other traffic or for when parked cars and oncoming traffic obstruct your progress. Ideally you only operate your wear-free brakes. Nevertheless, your foot always hovers over the brake pedal to allow you to intervene in the blink of an eye. Under these circumstances driving in a high gear at low engine speeds when the bus simply rolls does not represent a risk.
Is the terrain undulating, particularly outside of town? Then it is important to "let the bus roll" on downhill sections. This generates excess speed that will dissipate again on the subsequent ascent. If you are alert on country roads, you will start to slow down as soon as rooftops come into sight: They are harbingers of the next sign marking the town limits. Avoid top speed.
Anyone driving at 90 km/h instead of 80 km/h is only fractionally faster. But fuel consumption increases by ten per cent. Not in the least because that driver will have to slow down and then pick up speed again much more often.