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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 the VW diesels perform in cheat mode

Are you tired of the Volkswagen diesel emissions scandal? Yeah? We are, too. But here's a story that, at the very least, gives us something resembling answers about one of the most important questions surrounding the firestorm – how will the affected cars perform when they're in their emissions-cheating test mode? Consumer Reports was able to find out, tapping into what it believes is the cheat mode. By turning the car to accessory mode, flipping on the hazards, and tapping the gas pedal five times, CR was able to defeat the auto-engaged traction and stability controls, which it believes activates cheat mode. The safeties will reengage if it detects the rear wheels spinning, so the next step was what CR called "a hack." The team unplugged the rear wheel sensors, so the car's computers couldn't tell whether the wheels were spinning. By the way, don't try this at home. With that done, CR hit the road, testing both a 2011 Jetta Sportwagen TDI and a 2015 Jetta TDI sedan in their normal and cheat modes. Why both cars? Well, the 2011 uses the EA188 diesel, which represents the bulk of the affected cars, while the newer Jetta uses the latest EA288, which just arrived for model year 2015. The results are, in a word, interesting. The EA188 engine lost 0.6 seconds on the way to 60 miles per hour while in emissions-compliant cheat mode, and fuel economy fell from 50 miles per gallon to 46. For the newer EA288, the 0-60 difference was negligible – just a tenth of a second – while the fuel economy dipped from 53 to 50 mpg. There are a few takeaways here. First of all, and as suspected, running in cheat mode did hurt both performance and fuel economy. But perhaps more importantly, even in emissions-compliant mode, both vehicles easily beat their EPA fuel economy estimates. According to FuelEconomy.gov, the highest rated 2011 TDI Sportwagen, the manual-trans model, was rated at 30 mpg city and 42 mpg highway, with a combined rating of 34 (the auto drops the city and combined ratings by one mpg, while the highway falls by three). The best a 2015 Jetta TDI sedan can do according to Uncle Sam, meanwhile, is 31 city, 46 highway, and 36 combined with the manual (again, the auto is worse, but only by a single highway mpg). Related Video:

Join Autoblog editors for a full video tour of the 2019 Detroit Auto Show

The 2019 North American International Auto Show might have been a little more quiet than past years, but there were still some pretty major reveals, including the Toyota Supra, new Ford Explorer, Shelby GT500, Subaru WRX STI S209 and Kia Telluride. We also saw some lovely concepts like the Nissan IMs and Lexus LC Convertible. Senior Editor Alex Kierstein, Consumer Editor Jeremy Korzeniewski and Senior Green Editor John Beltz Snyder join me, Associate Editor Reese Counts — with Social Media Manager Michael Dylan Ferrara behind the camera — on a long walk through the show. We discuss cars, poke around the stands, dress a bloody wound and answer your questions in the Facebook comments. For more Detroit coverage, you can check out Autoblog's picks for the best in show, listen to our podcast or look at the best images from all the reveals. Finally, don't forget to watch Editor-in-Chief Greg Migliore hand over our 2019 Technology of the Year award. Related Video: Green Detroit Auto Show Acura Cadillac Chevrolet Ford GM Hyundai Infiniti Kia Lexus Nissan RAM Subaru Toyota Volkswagen Truck Convertible Coupe Crossover Hatchback Minivan/Van SUV Videos Sedan facebook 2019 detroit auto show live