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Silvretta e-car rally: VW XL1 wins the efficiency rating

Hans-Dieter Seufert
Silvretta E-Car Rallye
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The highlight of the Silvretta E-Car Rallye Montafon is the efficiency rating. This is where the electrically or partially electrically powered vehicles have to prove their economy. Not an easy task under the difficult conditions of an Alpine stage, as Alexander Bloch, chief technical reporter of a uto motor und sport and developer of the efficiency rating, emphasizes : 'This test situation is the ultimate for e-cars. An extremely demanding route with steep serpentine roads and several 1,000 meters of altitude, plus a high proportion of recuperation. Here the batteries, inverters and voltage regulators of the e-cars have to show what they're made of.'

0.655 liters of diesel per 100 km

For the Silvretta E-Auto, vehicles from Volkswagen get it. The VW XL 1 driven by the Tino Laue and Ruth Holling team won with total well-to-wheel emissions of 38.7 grams of CO2 per km and consumed just 0.78 liters of diesel and 4.51 kWh of electricity on the 119 km route , which corresponds to a consumption of 0.655 liters per 100 km.

Ranks 2 to 4 are followed by the three VW e-up, which achieved between 47 and 50.5 grams of CO2 per km. With 56.9 and 57.3 grams of CO2 per km, the two Smart Brabus electric drives are ahead of the Smart electric drive (58 grams of CO2 per km) in 5th to 8th place.

' Well-to-Wheel 'measurement method

The efficiency rating of the Silvretta E-Auto is based on the so-called' Well-to-Wheel 'method . In contrast to the 'tank-to-wheel' method, not only the pure vehicle efficiency is estimated, but the energy supply component is also included. So it's about the cycle from delivery to conversion into kinetic energy by the wheel drive.

This component is not included in the NEDC consumption. 'The energy consumption according to the well-to-wheel method is therefore around 19% higher,' explains Alexander Bloch.

The results of the energy efficiency evaluation were available on Saturday morning because the batteries had to go back to 100 % are charged - the energy consumption for battery charging is of course also part of the calculation of efficiency.

Bad luck for Brusa Golf eQmotion and more economicalE-sports car

In the night from Friday to Saturday, a fuse flew out at the Brusa Golf eQmotion, so that unfortunately the rating was no longer possible. The bottom line up until then was a consumption value of 1.12 liters - corresponding to 0.93 liters per 100 km.

'Of course you also have to take the vehicle concept into account,' says Bloch, 'the Tesla Roadster sports car is the best Take wacker, for example. With 215 kW it is by far the most powerful car in the field and comes in 10th with a well-to-wheel efficiency value of 76 grams of Co2 per km. '

For comparison: A Toyota Prius with a 73 kW petrol engine plus 18 kW e-motor, the 'well-to-wheel' method produces around 106 grams of CO2 per km - and 89 according to the NEDC. The Tesla Roadster with more than twice the output is included the Silvretta e-car efficiency rating is almost 30% lower. Alexander Bloch: 'Not bad for an e-super sports car, right?'

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