See also:

Fuel Requirements
* U.S. federal law requires that octane ratings be posted on gasoline station pumps. Vehicles with catalytic converters or oxygen sensors must use ONLY UNLEADED FUEL, which will reduce exhaust ...

The Inside
The Mazda3's cabin is another aspect that shines, especially for a car in its fifth year on the market without an update. Again, the Cobalt didn't compare in 2005, so it still doesn't, and I rate ...

Outside the United States
Government regulations in the United States require that automobiles meet specific emission regulations and safety standards. Therefore, vehicles built for use in the United States may differ fr ...