Fiat has rolled out the production version of its long-awaited two-cylinder gasoline engine family called TwinAir that's has been developed by FPT (Fiat Powertrain Technologies). The first car to receive the new turbocharged engine is the Fiat 500, in both three-door and convertible forms, with sales to begin from September, 2010.The innovative 0.9-liter two-cylinder gasoline unit implements