A vehicle that runs on natural gas and gasoline is called a bi-fuel vehicle. In factory built dedicated vehicles, compression ratios can be increased to take advantage of natural gas 130 octane rating. All natural gas vehicles whether dedicated or bi-fuel have an advanced timing to enhance the ignition of the fuel, which allows the fuel to burn more completely. Forty-two vehicle and engine manufacturers now produce 93 choices of natural gas vehicles, engines and chassis Worldwide. In North America, Ford, GM, Honda, Chrysler, Toyota and Volvo are currently offering or are testing natural gas passenger cars, vans, and trucks.
Total range depends on the amount of natural gas stored on the vehicle.
Most dedicated vehicles have a range of about 200 miles. Natural gas is abundant in North America. Dedicated NGVs are among the cleanest vehicles produced today. Low emissions are due in large part to the simplicity of the fuel. Spark plugs and fuel injectors benefit from a reduction in carbon buildup.