Mazda 2009 Mazda3 4-Door Owner's Manual page 109

Vehicle damage and drivability problems resulting from the use of the following may not
be covered by the Mazda warranty.
Gasohol containing more than 10% ethanol.
l
Gasoline or gasohol containing methanol.
l
Leaded fuel or leaded gasohol.
l
Fuel and Engine Exhaust Precautions
Before Driving Your Mazda
4-3