What are the differences between NGV gas and LPG?

Although for some people everything continues to be summarized to gasoline or diesel, there are new ways to start our vehicle. When talking about gas as a fuel, two terms usually arise: CNG and LPG . So that we have clear these two concepts, in .com we explain in detail what are the differences between NGV gas and LPG, so you can choose the most suitable for your vehicle.

What are they

First of all, we will give a few brief touches about what each of them is:

  • With the acronym GNV we refer to Natural Vehicular Gas, that is, methane.
  • For its part, when we talk about LPG we refer to Liquid Petroleum Gas .


One of the aspects that make the difference between NGV and LPG is the pressure that is worked with each one of them. In this way, Vehicular Natural Gas is stored at very high pressure (about 250 atmospheres) and is much lighter than Liquid Petroleum Gas .

For its part, LPG, which is a mixture of propane and butane, works at very low pressure and is heavier.

As a consequence of the different pressure they need to be stored, there is a noticeable distance between the weight of the tanks they require. Thus, the NGV, when needing very high pressure, the tanks have to be very heavy; the opposite of LPG, whose tanks can be lighter and larger.


Cost, a very relevant issue, is the other great factor that differentiates NGV from LPG, the latter being more expensive. In addition, it would be necessary to multiply the NGV by 3.1 to achieve the equivalent of one gallon of gasoline, that is, 3.7854 liters. However, LPG would have to be multiplied by 3.8.

Leak response

Due to its different composition, the response of the two gases to a leak is different. Thus, there is more risk of a flammable mixture with the air in the case of LPG . In this aspect, the disadvantage of NGV is that a leak is more difficult to detect.


LPG, like gasoline, generates a protective film that protects the metallic parts of the engines and injectors. The CNG is so clean that it does not generate this protection, which forces us to start the engine a few minutes before starting our journey.