The new FZ-S is powered by a newly designed air-cooled, 149cc single-cylinder engine which benefits from a closed loop fuel injection system. The same engine also powers the standard new FZ. Tweaked to deliver a better fuel efficiency, the engine now produces 13.1bhp of power and 12.8Nm of torque. For this new model, Yamaha is claiming a 14 per cent improvement in fuel economy. Yamaha FZ-S is good sport bike I also use and Yamaha FZ gets fuel injection and a new engine. Peak power and maximum torque have been shaved off and the bike loses weight too.mileage 53, engine 149cc top speed 107 kmph