1. Five of the Best Green Concepts of Recent Times
2. Ford Airstream
3. Chevrolet Volt
4. Lotus EVE Hybrid
5. Toyota Hybrid X
6. Saab 9-5 BioPower 100

Saab's BioPower 100 concept illustrates how a small, high-output engine can deliver high energy savings when fuelled by ethanol. The concept is the company's first dedicated bio-ethanol powered vehicle, employing a 2-litre in-line four-cylinder engine optimised to run on 100 per cent bio-ethanol (E100).

With the high octane ethanol fuel streaming into Saab's turbocharged engine, power output soars to a claimed 300bhp (or 150bhp per litre). This is a substantial increase over the previous 2.0t BioPower that ran on E85 - a mixture of 85 per cent ethanol and 15 per cent petrol - and only produced 180bhp.

Torque levels have also been raised to a claimed 295lb.ft for the BioPower 100 concept and the new fuel is said to enable the optimised engine to propel the car to 62mph in 6.6 seconds.

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