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Pursuit of efficiency
Pursuit of efficiency
When completed -- Carbon plans to unveil a prototype at the end of 2008 in Washington, D.C. -- the Carbon E7 will get to 60 miles per hour in just 6.5 seconds, the company claims. That would be fast for any car, but especially for one expected to weigh about two tons.

At the same time, the company expects fuel economy of 28 to 30 miles per gallon. To make that possible, the E7 will use a turbocharged diesel engine producing up to 300 horsepower and 420 foot-pounds of torque. While diesel fuel is more expensive than gasoline, at today's prices, diesel engines are much more fuel-efficient than gas engines.

The E7's top speed will be 155 mph, according to Carbon Motors.

NEXT: Nicer workspace

Last updated July 01 2008: 11:34 PM ET
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