, 2019-09-24 11:32:22

New standards for consumption values.

Closer to the real consumption: WLTP revises consumption values.

New consumption values apply as of September 2017. They are calculated using the new WLTP standard. WLTP stands for Worldwide Harmonized Light-Duty Vehicles Test Procedure. This is a worldwide standardised testing procedure for determining fuel consumption and exhaust emissions. Find out what this means for you and your Volkswagen.

Better clarity thanks to WLTP.

WLTP reforms vehicle manufacturers’ measuring and testing processes. An overview of the new procedure.

NEDC, WLTP and RDE: a quick comparison.

Longer distances, shorter idle times: WLTP puts the testing procedure for a vehicle’s measuring fuel consumption and CO2 emissions to the test. This is how the driving cycles differ. 


An overview of NEDC.

The standardised NEDC applies for all passenger vehicles and light commercial vehicles. It was introduced by the European Union in 1992 in order to determine the fuel consumption and vehicle-specific emissions and provide comparable values. The following overview shows you the framework on which these measurements are based.


An overview of WLTP.

The Worldwide Harmonized Light-Duty Vehicles Test Procedure or WLTP is a worldwide standard for testing passenger vehicles and light commercial vehicles. As of 1st September 2017, it is used to provide more realistic consumption specifications with its considerably more dynamic testing parameters. See the description in the following.

Goals of the new measurement procedure.

The WLTP driving cycle redefines the testing parameters for determining fuel consumption and exhaust emissions. The benefits at a glance:



New testing procedures allow for a more accurate assessment of a vehicle’s actual day-to-day fuel consumption.

WLTP utilises a profile more similar to actual day-to-day usage than the previous NEDC standard. This approach is similar to a synthetic laboratory test and primarily serves to enable comparisons between different vehicles without realistically reflecting the actual consumption. Whereas the consumption values were previously measured under abstract laboratory conditions, the new procedure now enables a more precise prognosis of the vehicle’s actual consumption thanks to improved test parameters. WLTP aims to simulate realistic vehicle behaviour in order to achieve far more realistic results. 



The new WLTP standard ensures comparable test results worldwide.

One of the primary objectives of the WLTP approach is to provide a standardised means of determining exhaust emissions and energy consumption for different engine systems such as petrol, diesel, CNG and electricity. Vehicles of the same type must deliver the same test results everywhere in the world when the WLTP measurement procedure is followed correctly. This necessary comparability is also why laboratory measurement is essential.

For this reason, the fuel consumption and emissions are reliably analysed on the roller dynamometer with a dynamic driving profile. 


Climate protection.

More realistic consumption information helps to achieve international climate targets and reduce the burden on the environment.

CO2 reduction is a key aspect of vehicle development. WLTP enables the compliance with international CO2 limits to be checked and documented.

In 2010, the EU alone produced 4.72 billion tons of CO2 emissions. 19% was produced by motor vehicles*. In view of this, the European Union intends to reduce emissions by 20% by 2020**. This goal will be achieved with the help of WLTP. Just like fuel consumption, the CO2 emissions of a vehicle depend on the specific model. WLTP creates greater transparency when comparing the energy consumption and CO2 emissions of different vehicles. This makes the measurements independent of the manufacturer and vehicle type. They also tend to be higher than the NEDC cycle. As a consequence, individual models and their engines will be optimised with a view toward climate protection.

*) The information is based on the paper “Mobility of the Future – Safe and Tested”, 16.03.2015, TÜV e.V. 

**) The information is based on the paper “CO2 regulation for passenger vehicles” published by the German Economic Institute of Cologne in 2013.

Simply save fuel.

Your vehicle’s fuel consumption depends on numerous factors that you cannot influence. Nevertheless, a number of simple tricks can still help you to significantly reduce your fuel consumption.


Drive easy, save easy.

Forward-looking and modern driving.

Half the stress, twice the savings: driving at a moderate and constant speed, less braking, moving with the traffic flow, letting the vehicle coast and using momentum all consume significantly less fuel. A driving style like this is also safer and far less stressful. On the highway: drive at 130 instead of 160 km/h and save. Plus, a forward-looking driving style also helps to avoid traffic jams. 


Shift more, refuel less.

Always drive in the highest gear possible.

Third gear at 30 – Changing gears earlier saves fuel. But does driving at low engine speeds actually damage the engine? That's a myth. TDI and TSI engines love to be up in third gear at 30 km/h – they develop an astonishing torque and acceleration at engine speeds as low as 2,000 rpm. Shift into second gear almost as soon as your vehicle starts to move. You can easily skip a gear when shifting up. And always choose the highest gear. 50 km/h in fifth gear is no problem for many vehicles: as long as your vehicle runs smoothly with a normal sound then the engine speed is not too low. 


Simply roll with it.

Use the fuel cut-off.

0.0 litres – drive for free! With the right techniques you can truly save fuel. Do you know how to achieve a “current consumption” of exactly 0.0 l/100 km? With the car in gear, just let the vehicle roll or coast along! The fuel cut-off stops the fuel supply to the engine. During this time you won't use even the tiniest drop of fuel. The best time to make use of this clever method is when you can also take advantage of engine braking. Like when you're going downhill or coming up to a red traffic light. Even when disengaging the clutch, you consume significantly less. This is especially effective if you can let the vehicle coast for longer distances thanks to a forward-looking driving style. 


More comfort, less consumption.

Use the accessories in moderation.

Save up to 2 litres with the right choices. Accessories make driving more comfortable but they are also more expensive when used excessively. An air conditioning system, for example, consumes more than a little fuel. Reducing and maintaining the interior temperature during mid-summer will use up to 2 litres per 100 km at low speeds. However, the temperature can also be reduced by ventilating the vehicle before the journey and starting off with the windows briefly open. While you are driving, always check which accessories you are currently using and which ones you actually need.


Keep up the pressure and save.

Check the tyre pressure.

Saving fuel starts before you even begin your journey. Save up to 15% by simply checking the tyre pressure! Rolling resistance amounts to as much as 15% of the total consumption. If you pump your tyres up to the pressure recommended for the fully loaded vehicle (the values are shown on the tank flap), this reduces the rolling resistance and fuel consumption. When you buy tyres, make sure they have the lowest possible rolling resistance. This saves as much as 3%. Plus, these tyres are also quieter. 


Ice-cold savings with a warm engine.

Avoid short distances.

Combining journeys saves more because the engine has the highest consumption when it is cold. If you frequently only drive short distances, your fuel consumption can quickly sky-rocket up to 30 l/100 km! However, you can save fuel by combining several stops into one trip. When you make longer journeys, your engine will able to reach the required operating temperature and use a lot less fuel. 


The smooth way to save.

Use low-friction engine oil.

Quality saves up to 5%: the quicker the engine is properly lubricated, the faster it produces fewer emissions. This is particularly important for cold starts and short trips. And what's the key quality of a good engine oil? That it spreads quickly.

Low-friction oils can't be beaten on that score. They reduce fuel consumption by up to 5% in comparison to conventional oils. That’s why almost all Volkswagen cars come factory-filled with low-friction oils. 


The path of least resistance.

Reduce aerodynamic drag.

Less drag means more efficiency. Ideal aerodynamics are the key to low fuel consumption, especially at higher speeds. That is why the body of your Volkswagen has been designed to create the least possible resistance. Fittings on the roof like bicycle carriers and roof-top boxes will negate all this. So make sure to remove roof carriers during the times between your ski and mountain bike trips. 


Saving can be so easy.

Avoid carrying around unnecessary ballast.

You can save up to 0.3 litres by simply removing every unnecessary kilo of weight. To be precise about it: 100 kg increases your fuel consumption by up to 0.3 litres for every 100 km. Therefore check what's in your luggage compartment on a regular basis. You can even save fuel when you refuel. Only fill the tank half way. Because a full tank increases the weight and, thus, the fuel consumption. 

Questions and answers.

The most important questions and answers for the new consumption values. 

NEDC (New European Driving Cycle) refers to a test bench measurement used throughout Europe since 1992 to record the exhaust emissions and fuel consumption of passenger cars and light commercial vehicles.

NEDC was replaced by the standardised worldwide test method WLTP (Worldwide Harmonised Light-Duty Vehicles Test Procedure). The new procedure is intended to provide a more realistic representation of a vehicle’s consumption. This is based on a modified test cycle with stricter test specifications.

In Europe, in addition to the WLTP, emissions are to be tested using the RDE (Real Driving Emissions) test procedure, whereby the measurements are made in actual driving conditions.

Whereas the WLTP takes place over 30 minutes on a rolling road test bed under standardised conditions, the RDE test takes place on public roads. The RDE test involves driving the vehicle on a mixture of roads with random acceleration and deceleration for approximately 90 to 120 minutes. Another difference: WLTP measures CO2, exhaust gas and fuel consumption, whereas RDE only measures exhaust gas and particle emissions.

The changeover to WLTP and RDE has been occurring gradually since September 2017. The WLTP test procedure will be compulsory for all newly registered vehicles from September 2018, as will the restriction of particle numbers (PN) in RDE. An RDE limit for nitrogen oxides will also be binding from September 2019 for all new registrations.

Yes, electric vehicles must also be tested according to the new WLTP rules.

EU6 or Euro 6 is the current emission standard for motor vehicles, which determines limits for pollutant emissions in the European Union.

The values determined according to WLTP will more realistically portray fuel consumption and CO2 and exhaust emissions. This can result in higher fuel consumption and CO2 emissions for vehicles with combustion engines being indicated as well as a smaller range of electric vehicles. Individual choice with regard to engines and optional equipment likewise has an effect on the fuel consumption and CO2 values. Depending on national legislation, this can also mean higher CO2 taxes.

The RDE test procedures on the other hand show how the vehicles perform in terms of exhaust gases in actual road traffic. The results from individual RDE drives can be viewed under the following link:

All Volkswagen models will gradually change over to the WLTP test procedures by September 2018.