CNG has been used as a vehicle fuel for around 30 years.

We found a few like this on CNG last week.

Now, the future of CNG cars looks a lot less certain.

CNG is transported at high pressure, typically above 200 bars.

And this was the only time we ever used the agency on CNG.

CNG is domestic, abundant and about 40% less expensive than diesel.

CNG argued they were class rights that could only be varied with its consent.

CNG was introduced as an auto fuel to keep air pollution under control.

Then there was the shortage of CNG in the big cities.

Scott, when would you like to go over the CNG scoop?

There are typically 5 main components in a CNG station.

CNG is compressed natural gas, methane stored at high pressure.

CNG is out in the marketplace making slow, but steady headway.

I'm not real sure who is doing your noms on CNG.

Most of these are converted to CNG from petrol or diesel.

Many of these taxis now run on CNG for fuel economy.

Converting to CNG may reduce fuel costs by around 50%.

Pakistan in a decade became the largest consumer of CNG.

Not only does CNG reduce green house gases it is also cost effective.

The same process is used for the conversion to CNG, but on a smaller scale.

China is also opening up the market for CNG in many of its southern provinces.

Most commercial vehicles can easily to be converted to run on CNG.

Gloria will let us know which CNG contract to path this deal with.

It may pay to make a call to CNG and confirm that all is back to normal.

Most of the public transportation fleet has been converted to CNG.

A compressed natural gas version is also in the works.

It can run on either petrol or compressed natural gas.

Using compressed natural gas would set a driver back $110.

About 21% of the country's vehicles run on compressed natural gas.

But the shift away from compressed natural gas could be controversial.

Compressed natural gas supplies in the city have also been affected.

However, it remains more common to design vehicles to use compressed natural gas.

"During this time, we will study the market for compressed natural gas in the county.

By government order, they’ve been replaced with vehicles that run on compressed natural gas.

In the medium term, vehicles running on compressed natural gas will have a major role.

It can offer compressed natural gas for cars even cheaper because of a federal tax credit.

He rode a bus that runs on compressed natural gas.

A portion of the fleet runs on compressed natural gas.

Compressed natural gas would require a new type of refueling station.

And, of course, few gasoline filling stations offer compressed natural gas.

The state would introduce compressed natural gas as a fuel for automobiles.

It may be powered by compressed natural gas or electric batteries.

One in five vehicles continues to use propane or compressed natural gas.

That is one reason experts say that compressed natural gas still has a future.

It is a concept version of Mazda3 with engine powered by compressed natural gas.

This would have overwhelmed any cost advantages for the compressed natural gas buses.

Buses running on compressed natural gas have been a much more common environmentally friendly technology in the past.

Buses use either compressed natural gas, electric batteries or a combination of both.

The facility also will dispense compressed natural gas to buses.

The bus fleet is exclusively powered by compressed natural gas.