Showing off its latest bit of mileage-maxing wizardry, Volkswagen rolled out its new Twin-Up! Concept at the Tokyo Auto Show. Combining the basic 4-passenger practicality of its standard Up! city car with a number of powertrain elements from the considerably more exotic 2-passenger Volkswagen XL1 - aka the world's most fuel-efficient production vehicle - this one-off reportedly "hints at" a possible volume-build successor. While it can't match the limited-run XL1's 261-mpg econo stat on the European Combined driving cycle, this far more conventional and decidedly more affordable alternative still boasts a pretty stellar 214 mpg figure.

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Like VW's XL1, the Twin Up! Concept is a plug-in hybrid that gets its motivation from a 2-cylinder 830cc TDI clean turbodiesel engine that makes 74 horsepower teamed with an electric motor. However, in the case of the Twin Up! -- which at 2,657 pounds is 51 percent heavier than the largely composite XL1 - it makes 35 horses and is fed by an 8.6kWh lithium-ion battery pack instead of the 27-horse motor and 5.5kWh battery in the XL1. The Twin Up! also has a larger 8.7 gallon fuel tank but power heads to the front wheels via the same 7-speed DSG dual-clutch transmission used in the XL1. Other vital stats include the ability to accelerate from 0-62 mpg in a fairly leisurely 15.7 seconds, an electric-only range of 31 miles and a top speed of 78 mph in EV mode or 87 mph with both power modules in operation. 

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The Twin Up! features an exclusive Sparkling White paint made with blue glass flakes that allows for subtle changes in the look of the finish under different lighting conditions. Inside, a "Ceramic" cloth-leather combo upholstery is set off with two different "corporate" blue hues while the bespoke digital instrumentation and user-configurable controls also carry an eco-themed blue-and-white motif.

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