Assertion: tractor's driver | /r/CapableOf | hold the engine
Facets:
value: in its optimum range
type: OTHER
value: regardless of road speed
type: OTHER
Source sentences:
text: Modern on-highway diesel engines are designed to provide maximum torque in a narrow RPM range (usually 1200-1500 RPM); having more gear ratios means the driver can hold the engine in its optimum range regardless of road speed (drive axle ratio must also be considered).