What does it mean to fill up a car with gas? What does it mean to add gas to a cab?

This is the first time I've ever seen a car with a compressed natural gas or liquefied natural gas in it, and it's usually found in specialized natural gas cars and cabs that use natural gas.

It's important to note that both specialized natural gas vehicles and fuel-converted cabs are uncommon at this point in time, and can only be found in some cities or regions, which is why the concept of refueling a car is so unfamiliar to motorists.

The main reason for this is that the transportation of gaseous fuels is more troublesome, requiring pipelines, high pressure or low temperature liquefaction, which requires a high level of technology, while traditional petroleum-based fuels do not have this concern, which directly contributes to the scarcity of natural gas refueling stations, and the inconvenience of using the car.

In addition, although the natural gas car is not as convenient to use as a traditional car, it has some advantages of its own. That is, natural gas is very safe to burn, environmental protection is high, the price of gas is also low, can greatly reduce fuel consumption.

It can also reduce engine oil consumption, reduce the wear and tear on the engine, which is conducive to prolonging the service life of the engine components, but also because of its economy, many regional cab drivers will choose to add gas to the car.