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at NAIAS. Biofuel Ferrari? Labeled as the 430 Spider Bio Fuel, the roadster runs on the familiar mix of 85% natural ethanol and 15% gasoline, which reports suggest yield a modest 2% increase in power. That's enough to bring the 4.3-liter V8's output up to 500 from the standard 490 with torque rising 4% and fuel economy improving by 5%