Question 8188
How can we achieve zero fuel consumption while the vehicle is decelerating?
- By reducing the vehicle's speed with engine braking.
- It is impossible.
- By pressing the clutch or putting the gear lever in neutral.
Show answer and explanation
Correct answer: By reducing the vehicle's speed with engine braking.
If you release the accelerator with a gear engaged and without pressing the clutch, fuel injection cuts off and the engine holds the car back without using fuel. This is engine braking. With the clutch pressed or the transmission in neutral, the engine returns to idle and uses fuel. When engine speed drops below about 1,000 rpm, fuel injection resumes to keep the engine from stalling.