Safe and Economical Driving
Above roughly what speed does the vehicle start to consume and pollute significantly more?
Reviewed on 29 Jul 2026
- A Above 40-50 km/h
- B Above 60-70 km/h
- ✓ Above 80-90 km/h
- D Above 110-120 km/h
Why this is the correct answer
Above around 80-90 km/h, fuel consumption and emissions rise significantly, mainly because of air resistance.
More questions on Safe and Economical Driving
- At what temperature should the cabin be kept so the air conditioning does not increase consumption excessively?
- Which accessory increases air resistance and therefore fuel consumption at high speeds?
- Driving at speed on an interurban road with the windows down:
- Regarding tyres, what directly affects fuel consumption?
- Regular vehicle servicing (filters, spark plugs, tyre pressure):
Practise this topic: 30 free questions, save your progress
Ready to pass the DGT theory test?
Practise official-format questions in English, with explanations after every answer and full progress tracking.
Try a free practice test