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. See Additives for additional information.
Gasoline Octane
California FuelChevrolet Cobalt Owners Manual. Instrument Panel
A. Outlet Adjustment.
B. Turn Signal/Multifunction Lever.
C. Cruise Control (If Equipped).
Driver Information Center (DIC).
D. Instrument Panel Cluster.
E. Audio Steering Wheel Controls
(If Equipped).
F. Hazard Warning Flashers.
G. Windshield Wipers and Windshield
Washer.
H. Audio System ...