Saab BioPower 100

The 300-hp engine that runs on 100 percent ethanol (E100) has virtually no chance of coming here due to the lack of infrastructure for pure ethanol. We burn a percentage fuel mixture of ethanol known as E85.

Thanks to increased airflow and higher compression ratios made possible by the octane-rich E100 (equivalent to 106-octane gasoline), the BioPower 100 cranks out 300 horsepower and 295 pounds-feet of torque from its turbocharged 2.0-liter engine. That's double the output of the gas turbo that runs in the European 9-5 2.0t. The concept car can run from zero to 60 mph in the low six-second range; it would easily dust its mild-mannered twin, which makes the run in a leisurely 9.6 seconds.

Combined city and highway gas mileage is about 25 mpg. That represents a 20 percent drop from gas mileage in the 9-5 2.0t cars.com

The engine also runs on E85 and gasoline, but without the kick and I would suppose better fuel economy.