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C1Difficulty 3/5

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; those throttle blips guarantee reduced fuel consumption.

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

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

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