The Aveo's Owner's Manual Recommended Fuel you use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, Gasoline Specifications (U.S. and Canada Only). At a minimum, gasoline should meet ASTM specification D 4814 in the United States or CAN/CGSB‐3.5 or 3.511 in Canada. Some gasolines contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT). We recommend against the use of gasolines containing MMT.

Vanessa
GM Customer Service