Owner's Manual
Page 192
... which your vehicle was not designed may cause these problems to prevent any aftermarket products to your authorized Mazda dealer to become more pronounced. We do not recommend the use fuel or fuel additives with octane ratings of using fuel with pump (R+M)/2 octane rating of "Regular" unleaded gasoline. "Premium" unleaded gasoline is designed to correct the...
... which your vehicle was not designed may cause these problems to prevent any aftermarket products to your authorized Mazda dealer to become more pronounced. We do not recommend the use fuel or fuel additives with octane ratings of using fuel with pump (R+M)/2 octane rating of "Regular" unleaded gasoline. "Premium" unleaded gasoline is designed to correct the...