Correct answer
Because it lengthens the shift and may require regaining speed with more fuel.
It lengthens the shift and adds clutch operations, potentially losing more speed and requiring fuel to regain it. A working synchronised gearbox does not need the manoeuvre in normal use. Follow manufacturer procedures; this is not a dual-clutch automatic gearbox or a fixed consumption claim for every situation.
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Because double-declutching always guarantees lower consumption.
Because it lengthens the shift and may require regaining speed with more fuel.
Because a synchronised gearbox always requires double-declutching for every shift.
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