Natural gas has a wide range application because of its high octane power. In a number of countries the use of propane or auto gas is gaining a great following among automobile users as the third most used vehicle fuel after diesel and petrol.
The propane is and odorless, nontoxic flammable hydrocarbon compound made up of a chain of three carbon attach to eight hydrogen elements. This complex mix is also called alkenes that when completely burnt up in extra oxygen will produce water, carbon dioxide and energy of fifty mega joule for every kilogram of propane.
Propane is available as gas but to be used in vehicle it is usually liquefied and mixed with other compounds such as butane and propylene. This makes it portable and potent in terms of the energy it generates.
Other compounds odorant compounds are added to make it easier to detect gas leaks. What makes propane a good alternative vehicle fuel is that it is not messy as diesel and produces less carbon deposit, which means less engine wear and oil changes.
Propane releases less carbon monoxide, toxins and smog than their gasoline when used as vehicle fuel
Safety
A number of individuals promote use of propane as fuel for vehicles since it performs the same as gasoline on new or well maintained vehicle. The liquefied propane is stored under modest pressure making the refueling task as quick as a gasoline refill. Furthermore, there are other propane refueling options for natural gas vehicle fuel enthusiast who can modify their automobiles to use the readily available propane cylinders during emergency. In terms of safety, propane tanks are designed to operate under extreme conditions. The tanks can resist puncture twenty times and up to four times operating pressure. While when it come to operation, propane powered engines have lower maintenance cost due to less wear and tear of parts.
Convenience
When it comes to convenience vehicles that use propane have the same engine and transmission parts. However, they have a different fuel storage and distribution system. Propane powered cars have high pressure fuel tanks that can take stress of over 200PSI before they fracture. In addition, their fuel distribution system has a special pressure storage tank that ensures the engine deliver steady performance even as the fuel pressure continues to declines on the main tank. To ensure that one gets the best performance from their propane engine, they need to inspect and repair their fuel system to keep it in top shape.
A present there are a number of propane powered vehicles being used worldwide. Unofficial estimates indicate that close to nine million vehicles are fueled by propane. Some of the automobiles come ready made from the manufacturers, while a growing number are able to use propane after a relatively affordable conversion process. The cost of fuel propane may be similar to that of gasoline but they give a much lower power performance because they are less dense than gasoline. Propane gives users fuel economy.

Article By: Levi Quinn Article Directory: http://www.articledashboard.com
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Here are some more blog posts and news about alternative fuel propane driven vehicles and conversion:
Clean Cities Initiative Parcels Out $300 Million for Alt Fuel
Only about100 of the 9000-plus alt-fuel vehicles to be subsidized with the grants will be all-elelctric, including at east 56 neighborhood electrics, or NEVs. But more than 1000 will be trucks and buses (and a few cars) using propane.
Stimulus grant helps state buy alternative-fuel cars
The News & Observer of Raleigh reported Thursday the money will help fund an initiative pushing electric, propane, ethanol and biodiesel vehicles. Stimulus grant helps state buy alternative-fuel cars
Cruising The Country in a Propane F150
People have been drag racing with propane powered cars since the 70′s IIRC. Too bad the fuel is not more mainstream here in the USA.
Asheville’s Alliance AutoGas offers police departments alternative
Earlier this year, Force 911 completed the installation of 30 Alliance AutoGas hybrid propane fuel systems for the Jackson County Sheriff’s Department in Georgia. The fuel converters installed a “propane hybrid” system in each vehicle, … Founded as long ago as 2008, Alliance AutoGas switches auto fleets from gasoline to clean-burning propane-powered vehicles. Cars and trucks are converted to propane power

Not sure about it’s safety, just take a look at those bg tube, just wonder how if, the propane is filling out caused by high pressure inside the tube, can be a risky thing, right?
However, great option for people who care about “green” issues, but electric vehicle seems another good option beside risky propane.