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 Service & Repair Manual. Door Trim Panel
Front
1.
Disengage front door upper trim panel
retaining clips, then remove trim panel, Fig. 1.
2.
Remove front door armrest retaining
screws, then disconnect electrical connector and remove armrest.
3.
...