Should you buy BMW 5 Series or Ford Mustang? Find out which car is best for you – compare the two models on the basis of their Price, Size, Space, Boot Space, Service cost, Mileage, Features, Colours and other specs. BMW 5 Series and Ford Mustang ex-showroom price starts at Rs 53.8 Lakh for 530i Sport Line (Petrol) and Rs 74.62 Lakh for V8 (Petrol). 5 Series has 2993 cc (Diesel top model) engine, while Mustang has 4951 cc (Petrol top model) engine. As far as mileage is concerned, the 5 Series has a mileage of 22.48 kmpl (Petrol top model)> and the Mustang has a mileage of 13.0 kmpl (Petrol top model).