For
the Fuel Economy Labelling Scheme for Passenger Vehicles, the Fuel Economy figure
displayed on the Label is based on fuel consumption information derived from the
UN ECE R 101 (urban cycle) test. The
test is conducted on vehicles that have been driven for at least 3,000 kilometres,
and it consists of two segments: the urban and extra-urban cycles.
|
Test
| Details
| | Urban cycle
| To be carried
out in a laboratory at an ambient temperature of 20°C to 30°C on a rolling road
from a cold start, i.e. the engine has not run for several hours. The cycle
consists of a series of accelerations, steady speeds, decelerations and idling.
Maximum speed is 50 km/h (31 mph), average speed is 19 km/h (12 mph) and the distance
covered is 4 km (2.5 miles). The cycle is shown as Part One in the diagram below
(Figure 1). |
| Extra-urban
cycle | This
cycle is conducted immediately after the urban cycle and consists of roughly half
steady-speed driving and the remainder accelerations, decelerations, and some
idling. Maximum
speed is 120 km/h (75 mph), average speed is 63 km/h (39 mph) and the distance
covered is 7 km (4.3 miles). The cycle is shown as Part Two in the diagram
below (Figure 1).
| 
Figure
1: Test Cycle as Specified in UN ECE R 101 Combined
Fuel Consumption Figure
The
combined fuel consumption figure represents an average of the two tests with a
weighting for the distance covered in each part. Difference
Between Test and Actual Fuel Economy
The
fuel consumption tests are representative of the average on-road fuel consumption.
However, their results may differ from fuel consumption under actual driving conditions
because: - Only one test vehicle is tested as being representative of
the model, and minor differences may arise within various individual vehicles
of the same model.
- There are differences in the driving patterns
for different motorists.
- There are differences in road, car and
weather conditions.
All of these factors would have an impact on
fuel economy/ fuel consumption.
|
