#1. At which of the following engine speeds should you drive your vehicle?
At any given speed, the engine develops both torque and horsepower. Peak torque is found at a lower engine speed than peak horsepower. The vehicle should be operated between the engine’s peak torque and peak horsepower. This range is referred to as the normal operating rpm range of the engine. The engine will lug (strain) if it is operated below peak torque for any length of time.