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In a lorry with a synchronised manual gearbox, does unnecessary double-declutching with extra throttle blips and slower shifts support efficient driving?

Correct answer

No; the unnecessary actions described can increase fuel consumption.

No. Those unnecessary actions can increase fuel consumption rather than reduce it. Synchronisers match the speeds of the gearbox components. Efficient driving avoids unnecessary throttle blips and unnecessarily prolonged shifts. Follow the manufacturer’s instructions. This scenario does not concern a non-synchronised gearbox that requires this technique or an automatic dual-clutch transmission.

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All options

  • Yes; fuel consumption never depends on how the accelerator is used.

  • No; the unnecessary actions described can increase fuel consumption.

  • Yes; those throttle blips guarantee reduced fuel consumption.

The real exam in English is a translation of the Spanish original; compare both here.

Show the Spanish original

En un camión con cambio manual sincronizado, realizar innecesariamente el doble embrague, con acelerones adicionales y cambios más lentos, ¿favorece una conducción eficiente?

  1. Sí; esos acelerones garantizan una reducción del consumo.
  2. Sí; el consumo nunca depende de cómo se utilice el acelerador.
  3. No; puede aumentar el consumo por las acciones innecesarias descritas.(Correct answer)

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