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The Volkswagen Mission Efficiency is the world’s most efficient near-production electric car, according to the company, showing how much influence aerodynamics have on the energy consumption and range of electric cars.
The prototype has set three world records:
Record number one: The vehicle achieves a Cd value of 0.158: a new record for road-approved cars.
Record number two: Consumption of 6.48 kWh/100 km – or 9.59 miles per kWh – during a so-called “ideal trip”, during which the speed (68 km/h or 42 mph) remains constant, there are no uphill slopes and peripheral consumers such as the air conditioning system are deactivated.
Record number three: Thanks to its aerodynamics and a highly efficient electric drive from the ID. Polo, the Mission Efficiency is also the most economical near-production electric car in its class.
On an officially documented consumption test drive over a distance of 1,278.36 km from Volkswagen’s German Development Centre in Wolfsburg via Poznań (Poland) and Olmütz (Czech Republic) to the Austrian capital Vienna, the Mission Efficiency achieved real consumption of 7.51 kWh/100 km including charging losses (6.89 kWh/100 km without charging losses). The route was completed with an average speed of 67.72 km/h; the top speed was 138 km/h. The 54.9 kWh battery (net) was only charged once during the journey. On arrival in Vienna, it had a remaining range of 164.0 km.
The vehicle set its three world records using affordable production technology from the ID. Polo and ID. Cross, based on the MEB+ platform with front-wheel drive. Two of the features adopted from series production are the 99 kW (135 PS) electric motor and the high-voltage battery.
The ground-breaking low air resistance, achieved as a result of the drag coefficient (Cd = 0.158) and small frontal area (A = 2.08 m2), is the Mission Efficiency’s central aerodynamic feature. It consists of a flow-optimised teardrop shape, small frontal area, active cooling air flaps, clad rear wheels and a fully clad underbody. The doors to the Mission Efficiency feature frameless windows, while the door handles have been integrated into the outer skin for optimum air flow. From speeds above 80 km/h, consumption is more than 30 per cent lower than in the standard version of the ID. Polo. At 140 km/h, the Mission Efficiency requires about as much energy as the ID. Polo at 100 km/h.
The shape of the Mission Efficiency’s body is reminiscent of the Volkswagen XL1; presented in 2013 and fitted with a plug-in hybrid drive, the XL1 was the most economical production car in the world at that time.
At 4,775 mm long and 1,392 mm tall, the Mission Efficiency coupé offers 2+2 seats and 481 litres of capacity in the luggage compartment. Additional stowage compartments under the rear seats and in the sides of the body create space for everyday items and the charging cable. While the front interior can be used without restriction, the two rear seats are intended for passengers up to a height of approximately 1.60 m. The prototype was designed so that it could theoretically be used by a young family of four. The body combines components of the ID. Polo with a self-supporting aluminium structure and components made of a high-strength carbon fibre-reinforced polymer (CFRP) and aramid composite.
Wheels are responsible for 25 to 30 per cent of the aerodynamic resistance. In the case of the front wheels, for example, the wheel arch was placed closely around the radius of the tyre to reduce turbulence in the wheel housing. In addition, new and patented rim deflectors are used on the inside of all wheels. They prevent air from entering the rims and causing turbulence. On the visible outside of the wheels, the flat, flow-optimised design of the hubcaps contributes to the excellent aerodynamics.
The optimal tyre is another point of leverage for reducing fuel consumption and increasing the vehicle’s range. Working closely with Continental, Volkswagen developed a concept tyre based on the EcoContact 7 series tyre, which with a rolling resistance of 4.9 kilogrammes per tonne is about 25 per cent below the threshold for the EU’s best tyre label class A. Essentially, the sidewall and the tread compound have been optimised to minimise energy losses during rolling.
Solar power and reduced interior. A photovoltaic system with a power output of 370 W is integrated into the glass roof and boot lid, and supplies power to the on-board electrical system’s consumers. Depending on the season, region and weather, it can increase the real range by up to 30 kilometres per day. In the interior, lightweight panelling, a mobile Bluetooth box as a replacement for the omitted speaker system and the “Bring your own device” concept reduce the weight: a smartphone or tablet takes the place of the infotainment system display.
