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Which change does a numerically higher final drive produce?

  • A.Lower engine speed at a given road speed
  • B.Improved fuel economy at motorway speed, because the engine turns more slowly for a given speed along the road
  • C.Better acceleration and a lower maximum speed
  • D.Better acceleration and a higher maximum speed, since the greater torque overcomes the aerodynamic drag more easily

Answer: C

A higher numerical ratio multiplies the torque more but raises the engine speed for a given road speed, so acceleration improves at the cost of cruising economy and top speed. The choice reflects the intended use of the vehicle. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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