There’s premium gasoline ... or above. Octane numbers, ethanol content and diesel get thrown in the mix, while TV commercials shout about special cleaning additives and better fuel economy.

The primary difference between 95 and 98 gasoline lies in the octane rating—a measure of the fuel’s resistance to combustion when compressed in a car engine. As the names suggest, regular ...

Focus on the octane rating displayed at the pump, not the color, to choose the right fuel for your car. Using premium gas in a car designed for regular gas won't provide any additional benefits ...