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IFEU Heidelberg

27

about 800’000km before they are sold to countries in eastern Europe. [INFRAS 1999a] states a life-time performance of only 0.54 Mio. km for city buses in Switzerland, but

Internet

trade

markets

(e.

g.

http://www.yakoub.de/index.html;

http://cat.workingwheels.com; http://www.used-buses.net) also sell used city buses with a performance of over 0.8 Mio. km. No information, however, is available on the fur- ther use of these buses. The value of 1 Mio. km used for exemplification is based on the assumption of a continued use of a relevant share of buses after their first use phase.

Annual performance

Years in opera-

Life-time performance

[km]

tion

[km]

Tab. 6: Life-time performance of city buses

Source

[BVG 2002]

12 - 14

800’000

[KING & HUTTON 2000]

84’000

[MAN 2002]

50’000 – 80’000

8 - 15

400’000 – 1'200’000

[VDV 2002]

60’000

10 - 14

600’000 – 1’000’000

[WMATA 2002]

15

> 672’000

IFEU 2003

Fuel consumption (l/100 km)

40

Weight (t)

15

Specific fuel savings (l/(100 km*100 kg))

0.15

Relative energy savings (%/10 %)

5.6 %

Life-time performance (km)

1’000’000

Life-time final energy savings (MJ)

54’000

Life-time primary energy savings (MJ)

62’000

Life-time CO2 savings (t)

4.5

Tab. 7: Overview of data for exemplification of an average city bus

Source: IFEU 2002 from various sources

IFEU 2003

The life-time primary energy savings are much higher for city buses than for pas- senger cars. This is due to the combination of high specific fuel savings and a high life-time performance. Data quality, however, is much lower in comparison to data for passenger cars. Especially the specific fuel savings used for city buses are estimates without scientific chargeable tests or simulations.

Energy savings by light-weighting

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