When driving a manual transmission vehicle, why should you run the engine in the highest gear range?
- To maintain lower engine rpms ✓
- To increase vehicle speed
- To prevent brake fade
- To pull heavier loads
Answer: A. To maintain lower engine rpms
Running the engine in the highest gear range keeps the engine in a low-rev range.
Why this is the answer
The handbook's smart driving section says to shift progressively at around 1600 RPM and to run the engine in the highest gear range so it stays in a low-rev range. Shifting before you reach maximum governed RPM is described as reducing equipment wear, lowering noise and saving fuel. So the point of using the tallest gear that still pulls the load is to hold engine speed down, not to go faster or haul more.
Why the other answers are wrong
- B. To increase vehicle speed — Gear choice at a given road speed does not raise your speed; the handbook ties high-gear running to low revs and fuel savings, not to going faster.
- C. To prevent brake fade — Brake fade comes from overheated brakes, and the handbook mentions the retarder for that, not running in the highest gear range.
- D. To pull heavier loads — The handbook says to pick a gear suited to the vehicle speed and load, so pulling heavier loads is about matching the gear to the load, not about running in the highest range.
Remember it
Climb the gears early and settle into the tallest gear that still pulls cleanly, letting the revs sit low.
Official handbook: Official MTO Truck Handbook, Driving efficiently – Smart driving practices