Question:
Which of these statements about double-clutching and shifting is true?
A
You can use the tachometer to tell you when to shift.
explanation
Study the driver's manual for your vehicle and learn the operating rpm range. Watch your tachometer, and shift up when your engine reaches the top of the range. (Some newer vehicles use "progressive" shifting: the rpm at which you shift becomes higher as you move up in the gears. Find out what's right for the vehicle you will operate.) [Commercial Driver Handbook]
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