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100 kg*100 km4. These, however, are rather conservative values of the data for pas- senger cars with modified rear axle transmission.

5.1.3 Life-time performance

Most passenger cars operate up to 15 years in the industrialised countries of Europe and North America. It is difficult to quantify the share of vehicles which exceed this age and are, for example, exported to other countries. The average annual performance of passenger cars is very different for the respective countries and varies between 10’000 and 15’000 km.

200’000 km (or 120’000 mi which is equivalent to 193’000 km) is a widely accepted life-time performance for average passenger cars in Europe as well as the US ([REPPE et al. 1998], [RIDGE 1997], [KELLY & DAVIS 1998]). Special vehicles (e.g. taxis or company cars), however, have a much higher annual performance of up to 100’000 km. Other vehicles may only be used as second cars or on weekends and may have a much lower annual performance (e. g. half of the average performance).

We will therefore, in addition to the gasoline and diesel car with average performance, exemplify the possible range of life-time energy savings in two examples. On the higher end of the spectrum we will look at a diesel taxi (it is assumed that cars with high performances will be diesel cars) with a life-time performance of 800’000 km. On the lower end we look at a light gasoline car with only 100’000 km life-time performance.

5.1.4 Life-time energy savings

Final and primary energy savings for a 100 kg weight reduction vary significantly for the defined vehicles. Over 4 times the life-time energy savings of typical private vehicles (25

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    27 GJ) can be achieved by the high performance taxi (115 GJ), mainly due to the

higher life-time performance. In addition to the high life-time performance, also higher specific energy savings have been assumed, because taxis mainly operate in an urban driving cycle.


For further calculations in section 7.2, relative energy savings (%/10 % weight reduction) will be required. Taking the average weight of the German passenger vehicle fleet of 1310 kg, a share of 40 % Diesel vehicles and an average consumption of 7.6 l/ 100 km, these absolute reduction numbers correspond to 5.7 % which will be used in the calcula- tion in section 7.2.

Energy savings by light-weighting

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