首先明確一點：改氣的車多數是小型代步車或者開過幾年的緊湊車，很少有人去改15萬以上的車（偶爾有也都是十多年的老車）。

而現在汽車用氣的人卻不多，先來算一筆費用，以一台1.6L的發動機為例，平均每行駛一公里要花5毛錢左右，改氣後平均每公里花費在3毛多，每公里能省1.5毛左右。每一萬公里就能省出1500元。為什麼一些私家車主明知道燒氣便宜還不改氣呢？我覺得有這幾個原因：1、心疼汽車

Oil-to-gas requires some changes to the engine, which in our opinion is like surgery on someone. So a lot of people don't want to start the engine. 2. I am afraid that the gas tank is unsafe and takes up space

The compressed natural gas tank is filled with high-pressure natural gas, although the danger is not particularly great, but after all, it is not safe. And the gas tank really takes up space. 3. Refueling is far less convenient than refueling

It can be said that it is too simple to find a gas station in most cities in the country, but it is difficult to find a gas station unless it is in Urumqi, which is a gas source, and it is difficult to find it in other places, and it generally takes a long way to refuel, and it takes longer to refuel. This is also why many cars in Urumqi have changed their gas, after all, it is much more convenient to refuel than in other places. 4. Fear that the oil will change to gas and hurt the engine and the power is insufficient

Natural gas has a high calorific value, more heat released from combustion, and the probability of problems in the gas engine is greater. Moreover, the gas takes up space, and the intake efficiency is low, so the power will be reduced.