There is great potential for Compressed Natural Gas (CNG) due to it having very low emissions. Compared to gasoline, CNG combustion produces about 25% less carbon dioxide (CO₂). Furthermore, CNG has a great potential for reducing untreated emissions. The exhaust gas is odorless and contains no particles.

CNG also has an advantage when being prepared as a fuel: it needs no additives and its production does without complicated refining processes. Another advantage is that CNG vehicles place no load on the world's scanty petroleum resources. Methane, CNG's major component, can also be produced from organic substances. This closes the CO₂ cycle and longterm availability is increased even further.

CNG vehicles have proven themselves for years now. Since CNG filling stations are still few and far between, the vehicles are mostly equipped with bifuel systems, and the engine can run on either natural gas or gasoline.

CNG has a very high knock resistance (130 ROZ as opposedto between 91 and 100 ROZ for gas­oline). This re­presents further potential for optimization of the CNG engine. This is ideally suited for supercharging, allowing downsizing concepts to be applied with the accompanying improvements in efficiency.