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The decrease speeds and car fuel consumption Document of the Ministry of Infrastructure, Transport, Regional Planning, Tourism and the Sea.

Relations between speed and consumption of a vehicle (passenger car but applicable to other vehicles): curves and equations.

Lowest consumption 100 km is not achieved at lower speeds. For a current car, the minimum consumption of optimum speed is between 70 and 90km / h.


2002 the second half marked a break in the statistics of road safety with unprecedented speed and lower the accident. This decrease speeds have also contributed to the decrease of fuel consumption in the transport sector.

For passenger cars (PC), the effect of lower rates is estimated to 0,9% to 2,2% according to calculation methods, either 0,2 to 0,5 million tonnes oil equivalent (Mtoe) in less of an annual total consumed 43 Mtoe or between 9 and 22 liters of fuel saved per vehicle.

At the same time, traffic increased 0,7% between 2002 and 2003. However, these figures should be considered with caution because other factors influence the development of unit consumption increased (generalization air conditioning or
lower city speeds) or down (distribution of traffic by type of network for example).

- Debate on the car of the future
- Future Forum on Travel
- Must go faster on motorways or not?

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