By vanessaandglenn | AA Member | 1 Post | 11 September 2011 at 2:23pm what sort of fuel should I be using for a Mazda 6 2005? 91 or 98? By jbiddle | Community Member | 1657 Posts | 16 September 2011 at 12:55pm Our information is suggesting 91 octane is fine. Go Jump to Accessories and extras Accessories and extras Buying or selling Buying or selling Servicing, repair, faults and reliability Servicing, repair, faults and reliability Fuel and economy Fuel and economy Motoring Rules & Regulations Motoring Rules & Regulations