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X-Tracer Team Switzerland's E-Tracer No. 79
X-Tracer Team Switzerland's E-Tracer No. 79
Team from: Winterthur, Switzerland
Class: Tandem
Prize: $2.5 million
Fuel: Electricity
Fuel economy: 205.3 MPGe

Cars in the "tandem class" were two-seaters with the occupants sitting one behind the other. In this case, you might question the use of the word "car" since this vehicle looks an awful lot like a motorcycle. It does have four wheels, though. It's just that two of them fold up and out of the way while driving, dropping down at low speeds to provide stability.

Its bike-style body saves a lot of weight, which confers advantages in both efficiency and performance. In tests, this car got to sixty miles per hour in a relatively blistering 6.6 seconds.

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Last updated September 17 2010: 2:48 PM ET
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