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. Competitive Driving Mode (SS Models Only)
The driver can select this optional handling mode by
pressing the ESC/TCS button on the console two times
quickly. COMPETITIVE MODE will be displayed in the
DIC. See DIC Warnings and Messages.
Competitive Driving Mode allows the driver to have full
control of the front wheels while the ESC syst ...