Turns out going green can sometimes cost a lot of green. It's no surprise that Bentley's bio-fueled Continental Supersports will be priced out of the hands of the typical eco-friendly driver, but the $267,000 list price will put it in very rare territory for even trust-funders.

The $43,000 premium over the Bentley Continental GT Speed yields an extra 21 hp (or about $2K per pony.) The extra cash for the Supersports is not just about power, but getting less (weight) as well. A lot of glut was removed from the interior and replaced with lighter composite materials. The rear seats were completely removed, and the remaining front buckets use carbon fiber for rigidity. Bentley says the car is now 243 lbs lighter then the Continental GT Speed, which represents about a four percent total weight reduction.

Continental Supersports is powered by a 6.0-liter W12 engine that delivers 621 hp. It does 0 to 60 in 3.7 seconds (0.6 seconds better than the GT Speed), 0 -100 mph in 8.9 seconds and can hit a top speed of 204 mph (2 more than the GT Speed). Orders for U.S. cars will start to be taken in October, but those will be gas-only cars. Well-heeled environmentalists will have to wait until next summer for the full 621 hp bio-fuel model.

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