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TRANSLOGIC 150: Volkswagen XL1

How do you build the world's most fuel-efficient production car? Start with the world's most aerodynamic design. The Volkswagen XL1 is capable of 261 miles per gallon thanks to its sleek shape and ultra efficient plug-in diesel hybrid powertrain. The downside is that only 250 will be made and none will be sold stateside. That didn't stop us from taking our turn behind the wheel of this truly revolutionary ride.

How VW's hyper-efficient XL1 will influence the next Golf

In 2007, the European Union mandated fleet average CO2 emissions of 158.7 g/km. For 2015, that figure will drop to 130 g/km, and the target for 2020 is an ambitions 95 g/km. Thanks to some German politicking, that target will be phased in from 2020 to 2024, but it will still apply to 80 percent of passenger cars in that first year. In US miles per gallon, that's the equivalent of going from about 35 mpg to 42 mpg to 57 mpg. The current Volkswagen Golf is rated from 85 g/km of CO2 to 190 g/km depending on model - and zero for the e-Golf, so for the next-generation MkVIII hatch due in 2019, to meet the goal, Volkswagen engineers will need to introduce a bunch of new tricks. According to a report in Autocar, VW be mining its hyper-efficient XL1 for some of them.
Predictions for the next Golf include a variable-compression engine, an electric flywheel and an electric turbo, along with taking greater advantage of coasting. Volkswagen could be getting help from Audi with the electric turbo and variable-compression engine and electric turbo, with Audi already having shown off the former and brand technical boss Ulrich Hackenberg confirming the VW Group is working on the latter. It's possible the flywheel system could also have the mark of The Four Rings: Autocar mentions a British system that Volvo is testing, but the R18 e-tron Quattro racer has been using one for years.
The need for such features is because the company won't be able to net enough future gains from just aerodynamic improvements and advanced materials. As price will be a factor (the regulations are expected to "add hundreds of euros to the cost of building a car"), adding much more aluminum or carbon fiber is an unlikely option. We're told the next generation won't be longer or wider than the current car, and being Europe's most popular model, VW doesn't want to make a big bet on futuristic aero, but the report says the MkVIII will "likely" have "the most aerodynamic treatment yet seen on a production vehicle," the area where lessons learned from the XL1 will truly be seen.

Take a listen to the Volkswagen ID 3 and Koenigsegg Jesko

What could better demonstrate our diametric vehicular future than sound clips of the Volkswagen ID 3 and the Koenigsegg Jesko? Battery-electric vehicles don't make enough noise on their own, so VW partnered with composer Leslie Mandoki for the legally-mandated Acoustic Vehicle Alerting System (AVAS) that warns pedestrians and cyclists of the EV's presence. Mandoki — a German-Hungarian who once played drums in a Euro disco band called Dschinghis Khan — was asked to come up with a sound for the ID 3 that VW said "defines its identity," "radiates safety and the promise of effortless mobility," and that "must also impress with its unique character." The definition of the ID 3's single-motor, 201-horsepower character is this: Occupants and people around the hatch can hear the sound as the car accelerates to 18.6 mph, and when reversing. At higher speeds, the sound of wind resistance and tire noise takes over. As our library of AVAS tones grows, it's clear that EVs will provide a soundscape as varied as that of internal combustion engines. Here, for instance, is the industrial thrum used as the Karma Revero GT's pedestrian warning: And here is the sci-fi soaring from the BMW Vision M Next, as composed by Hans Zimmer: At the other end of the aural chamber, we have the Koenigsegg Jesko. In this case, the composer is a 5.0-liter twin-turbo V8 running on a bio-ethanol E85 blend that's almost suitable for IndyCar, powering the engine up to 1,600 horsepower. Output on pump gas will be 'only' 1,281 hp. The Swedish automaker released a clip of the exhaust note of a car in progress inside the Angelhom factory. Here's what we can look forward to: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. All these sounds have a place at the table, even if we'd prefer Karma booked some time with a producer and an Autotune session. To paraphrase Sesame Street, though, one of these sounds is definitely not like the other.