Commission Delegated Regulation (EU) No 134/2014Show full title

1.4.3. Fuel consumption (FC), expressed in litres per 100 km (in the case of petrol, LPG, ethanol (E85) and diesel) or in kg per 100 km (in the case of an alternative fuel vehicle propelled with NG/biomethane, H₂NG or hydrogen) is calculated using the following formulae:

1.4.3.1.

for vehicles with a positive ignition engine fuelled with petrol (E5):

Equation Ap1-1:

;

1.4.3.2.

for vehicles with a positive ignition engine fuelled with LPG:

Equation Ap1-2:

.

If the composition of the fuel used for the test differs from that assumed for the calculation of normalised consumption, a correction factor (cf) may be applied at the manufacturer’s request, as follows:

Equation Ap1-3:

.

The correction factor is determined as follows:

Equation Ap1-4:

;

where:

n_actual

=

the actual H/C ratio of the fuel used;

1.4.3.3.

for vehicles with a positive ignition engine fuelled with NG/biomethane:

Equation Ap1-5:

in m³;

1.4.3.4.

for vehicles with a positive ignition engine fuelled by H₂NG:

Equation Ap1-6:

in m³;

1.4.3.5.

for vehicles fuelled with gaseous hydrogen:

Equation Ap1-7:

For vehicles fuelled with gaseous or liquid hydrogen, the manufacturer may alternatively, with the prior agreement of the approval authority, choose either the formula:

Equation Ap1-8:

or a method in accordance with standard protocols such as SAE J2572.

1.4.3.6.

for vehicles with a compression ignition engine fuelled with diesel (B5):

Equation Ap1-9:

;

1.4.3.7.

for vehicles with a positive ignition engine fuelled with ethanol (E85):

Equation Ap1-10:

.