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All B licence questions · DGT question bank

As DGT guidance for a combustion-engine car, approximately how much can unnecessarily running air conditioning increase fuel consumption?

Correct answer

Approximately 10–20%, as guidance.

DGT gives an indicative range of 10–20%. It is not a fixed percentage or a physical maximum for every vehicle: it depends on the system, temperature and operating conditions. Use climate control sensibly to maintain attention, visibility and comfort; do not sacrifice demisting or avoiding excessive heat to save fuel. In an electric car it affects energy use and range rather than fuel consumption.

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  • Always exactly 40%, in every vehicle.

  • Always exactly 2%, in every condition.

  • Approximately 10–20%, as guidance.

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

Show the Spanish original

Como orientación de la DGT para un coche de combustión, ¿qué aumento aproximado de consumo puede suponer llevar el aire acondicionado conectado sin necesidad?

  1. Aproximadamente entre un 10 y un 20 %, como orientación.(Correct answer)
  2. Siempre exactamente un 2 %, en cualquier condición.
  3. Siempre exactamente un 40 %, en cualquier vehículo.

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