During a prolonged wait in a safe place, when vehicle systems allow stopping and restarting the engine without compromising safety, can switching off a car’s engine reduce fuel use?

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sacatelcarnet · Accepted Answer

Yes. Yes, it can avoid fuel use at idle; this is not limited to interurban roads. Follow manufacturer instructions and the stop-start system’s operation, if fitted. Do not manually switch off the engine while moving or compromise necessary functions. Tunnel immobilisation and refuelling have specific rules and do not permit arbitrarily waiting two minutes before acting.

sacatelcarnet · Answer

This measure will only be useful on interurban roads.

sacatelcarnet · Answer

No, because starting the engine would use more fuel.

During a prolonged wait in a safe place, when vehicle systems allow stopping and restarting the engine without compromising safety, can switching off a car’s engine reduce fuel use?

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