This is what I could fine on your question
The key difference between LPG and CNG is what they consist of.
LPG consists of butane, propane and a variety of other chemicals, whereas CNG consists of mostly methane gas.
Answer:
The answer should be the first one.
<span> Governments want vast amounts of power and when we have a free market economy removes government power from a huge chunk of our lives. Free, or traditional market means no taxes, no taxes means no extra money for the government.</span>