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Which loss occurs while the vehicle is being driven?

  • A.Diurnal loss, which occurs as the fuel warms during the journey and therefore generates vapour continuously
  • B.Hot soak loss
  • C.The running loss, produced as the fuel and its system warm during operation and vapour is generated continuously
  • D.Running loss

Answer: D

Running loss occurs during driving as the system warms. The last option describes exactly that condition, which makes it a correct and more detailed version. Diurnal loss applies to a parked vehicle. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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