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. Troubleshooting
Brakes Grab
1.
Contaminated, worn or faulty brake
linings.
2.
Drum or brake rotor out-of-round.
3.
Faulty brake booster.
Brakes Inefficient/Hard Pedal
1.
Conta ...