Ford has unveiled its third-generation Fiesta ST ahead of its public debut at the Geneva motor show next month, which will debut a powerful and frugal 1.5-litre turbocharged three-cylinder petrol engine. The new all-aluminium powerplant produces 149kW of power and 290Nm of torque, offering 15kW and 50Nm of extra potency over the 1.6-litre turbo four employed by the outgoing second-gen ST.