You are driving a motor vehicle with a manual gearbox on a level carriageway. How should you change gears so as to drive in a particularly environmentally conscious and economical way?

You selected both "Changing up gears as early as possible" and "Changing down again as late as possible," which are correct.

To drive in an environmentally conscious and economical way with a manual gearbox, you should shift up to a higher gear at a low engine speed and only shift down when necessary. This keeps the engine running in its optimal, fuel-efficient range and avoids unnecessary fuel consumption. Driving at high engine speeds (revs) uses more fuel and creates more emissions, so you should avoid waiting until the upper engine speed range before shifting up. Following this rule helps save fuel and reduces environmental impact during normal driving.