BERLIN (Reuters) - Volkswagen's premium brand Audi wants to cut costs by 15 billion euros (13.04 billion pounds) by 2022, Germany's Manager Magazin business monthly reported on Thursday, citing Audi executives.An Audi spokesman said cost savings have not yet been finalised, but the scale of the cost cuts reported by the magazine was correct.Savings are particularly important for VW after an emissions scandal and associated fines. It also faces a big bill to make its combustion engines comply..