Question 8199
Regarding efficient driving, in passenger cars with diesel engines, at what engine speed, as a general rule, is it recommended to shift up to a higher gear?
- When the engine is between 1,300 and 2,000 revolutions per minute.
- When the engine is between 2,500 and 3,500 revolutions per minute.
- When the engine is between 800 and 1,000 revolutions per minute.
Show answer and explanation
Correct answer: When the engine is between 1,300 and 2,000 revolutions per minute.
In a diesel, you generally shift up between 1,500 and 2,000 rpm, within the 1,300 to 2,000 range, because the engine delivers its pulling power at low engine speeds. At 800 or 1,000 rpm, the engine is barely above idle.