The latest Fiesta ST-Line – sold from 2018 – is available with what Ford calls a 1.0T EcoBoost petrol engine or a 1.5 TDCi diesel. In both cases, you can choose from a range of power, 98bhp to 152bhp for the petrol and 83bhp to 118bhp for the diesel. Certain versions of the petrol engine have mild-hybrid assistance, an extra electrical system that helps improve fuel economy and reduce emissions. You can also have an automatic gearbox with the petrol engine.
Similar engines are available in the older, previous-generation Fiesta ST-Line, sold from 2016 to 2017. The 1.0 EcoBoost petrol engine has 98bhp to 138bhp and the 1.5 TDCi diesel has 93bhp.