First gear should be used:

First gear should be used:
A)For a long time before shifting to second gear.
B)Until reaching a speed of 30 km/h.
C)Only to set off and changed as soon as possible.Correct
Proper gear management is one of the key aspects of efficient driving.
Driving in higher gears at low engine speeds results in lower fuel consumption.
We should use the highest gear possible (4th or 5th) even in the city, and keep the engine running at low revs.
With lower gears, the engine runs at higher revs and will consume more fuel.
First gear has a lot of power but low speed, so using it for a long time will cause fuel consumption to skyrocket. It should only be used to set off and should be changed as soon as possible, after 2 seconds or 6 metres.