Driving range depends on how much energy can be carried on a vehicle. Both CNG and LNG have less energy by volume than diesel or gasoline. This means that natural gas needs more space for the same amount of energy. Trucks and buses that return to the yard at night or operate in regional corridors are well-suited to natural gas use. Daily driving range needs can be met and fuel storage can be sized to meet fleet needs. Tank packages for natural gas vehicles are available in a range of sizes and configurations.
A highway tractor powered by LNG and equipped with Westport’s two-tank system has a range of up to 800 to 1,000 kilometres depending on the duty cycle. Trucks and buses that use the Cummins Westport ISL G engine vary in their driving range depending on the tank package and how the vehicle is used.
Natural gas is priced on an energy equivalent basis. The term for this is “diesel litre equivalent.” LNG is a liquid fuel like diesel. To get the same amount of energy in one litre of diesel, 1.7 litres of LNG are needed.
To get the same amount of energy as there is in one litre of diesel, approximately one cubic metre of CNG is needed.