2021 Mazda3 Owner's Manual | Mazda USA
www.mazdausa.com › static › manualsU.S. federal law requires that octane ratings be posted on gas station pumps. Fuel with a rating lower than 87 octane (91 RON) will negatively affect the emission control system performance and could also cause engine knocking and serious engine damage. USE ONLY UNLEADED FUEL. Leaded fuel is harmful to the catalytic converter and oxygen sensors ...
Actual MPG from 66 2021 Mazda 3 owners - Fuelly
www.fuelly.com › car › mazdaBased on data from 66 vehicles, 3,574 fuel-ups and 897,927 miles of driving, the 2021 Mazda 3 gets a combined Avg MPG of 28.67 with a 0.19 MPG margin of error. Below you can see a distribution of the fuel-ups with 47 outliers (1.30%) removed. Following shows the average MPG of each of the 66 vehicles in the system. «.