The words "diesel" and "Maserati" have rarely, if ever, been associated - but now the Italian luxury car firm is considering a diesel-engined version of its new Quattroporte saloon, according to UK website A source told 4car this week that "every top-class saloon must now have a diesel option". And added that the firm has been studying feedback from customers which suggests that they are interested in everyday usability, for business as well as pleasure, hence "in the future for Maserati a diesel engine has to be considered." Maserati's petrol engines are not known for their frugality, and even at the top end of the market, fuel economy is a consideration for many buyers.