Original sentence: The Dardo, based on the  Fiat X1/9, had a mid-mounted engine made by Fiat - the Dardo F 1.3 had a 1.3 litre engine, Dardo F 1.5 had a 1.5 litre engine
Edited sentence: The Dardo, based on the  Fiat X1/9, had a mid-mounted engine made by Fiat - the Dardo F 1.3 had a 1.3 litre engine, Dardo F 1.5 had a 1.5 litre engine (not surprisingly)