Frequently Asked Questions About Compressed Natural Gas

What is CNG or NGV?

CNG (compressed natural gas) or NGV (natural gas for vehicle) natural gas is a mixture of gases, methane (85 to 98%).

Is LPG the same as CNG?

NO! LPG is a mixture of gases, butane and propane stored in a liquid state. Propane is a low-pressure liquefied gas and CNG is high-pressure compressed natural gas. The storage pressures are between 8 to 15 bars (116 psi to 217.5 psi) for propane and 200 to 250 bars for CNG (3000 psi and 3600 psi). In spite of being highly pressuring, CNG is much less explosive than LPG or even gasoline.

Which vehicles can be converted?

With an EPA-approved sequential injection conversion kit any 4, 6 or 8 cylinder gasoline vehicle - domestic or foreign, car, van, SUV, or truck can be successfully equipped for operation of HYBRID BI-FUEL (CNG or gasoline) regardless of mileage.

What are the advantages of using CNG?

In Mississippi CNG is approximately ½ the cost of gasoline, result is saving 50% of the current gasoline budget, using our own natural resources and minimizing dependency on foreign oil, and at the same time helping the environment by burning CNG that is fourteen times cleaner than gasoline. Maintenance and oil changes are extended 4-5 times due to the cleaner operation.

What is the life expectancy of a CNG conversion system?

With the conversion system properly installed and maintained, it will outlast most any vehicle. The tanks however do have a limited life span. 20-year tanks are suggested as a minimum.

Is the usage of CNG harmful to the engine?

No, the opposite is the case. The usage of CNG can extend the life of the engine. This happens due to the clean combustion of CNG and the fact that no carbon is generated during combustion. The engine components and oil are not subject to the contamination produced by using gasoline or diesel as fuel.

Is the gasoline tank removed?

No, not on an hybrid bi-fuel system. The CNG system uses its own storage tank, usually mounted in the cargo area or underneath the vehicle, depending on available space and driver - owner preference.

Is it possible to remove the CNG system and return the vehicle to gasoline only?

Yes, the system can be removed at any time without affecting the gasoline system. Usually the only time this might be done is when the vehicle owner wants to sell the vehicle and feels he/she could not recover the conversion cost with the sale or in cases where the owner would like to reinstall the system on any new vehicle.

Will my vehicle have any negative effects after the conversion system is installed?

Not if the installation is completed and inspected by qualified and certified installers and inspectors. No need for concern.

Can I switch from CNG to gasoline while in operation?

Yes, with the conversion you have a fuel gauge, with a touch on – touch off switch conveniently located on the instrument panel. This can be done at any time during operation; however most times it is not used, the reason being all CNG-gasoline switching is done automatically and seamlessly. All the driver has to do is drive and enjoy the savings.

How will CNG affect the fuel mileage and performance?

NG is rated at 130 octane and gasoline is rated at 85-90 octane, with the conversion technology allowing precise distribution giving each cylinder the same amount of energy in NG as gasoline and the performance and fuel mileage will remain the same at (+/-) 3%.

What is a Gasoline Gallon Equivalent (GGE)?

A GGE is a factor that describes the number of gallons of a fuel that has the equivalent amount of energy as one gallon of gasoline. If one gallon of the fuel has less energy than one gallon of gasoline, you will need more of that fuel to drive the same distance as you would drive on one gallon of gasoline.

Below is a chart of energy sources and their relevant conversion values.

Fuel Type Unit of Measure BTUs/Unit Gallon Equivalent
Gasoline gallon 114,100 1.00 gallon
Diesel #2 gallon 129,500 0.88 gallon
Biodiesel (B100) gallon 118,300 0.96 gallon
Biodiesel (B20) gallon 127,250 0.90 gallon
Compressed Natural Gas (CNG) cubic foot 900 126.67 cubic feet
Liquid Natural Gas (LNG) gallon 75,000 1.52 gallons
Propane (LPG) gallon 84,300 1.35 gallons
Ethanol (E100) gallon 76,100 1.50 gallons
Ethanol (E85) gallon 81,800 1.39 gallons
Methanol (M100) gallon 56,800 2.01 gallons
Methanol (M85) gallon 65,400 1.74 gallons
Electricity kilowatt hour 3,400 33.56 kilowatt hours

Last but certainly not least: Is CNG Safe?

Yes, CNG is stored in a cylinder comprised of steel and/or very strong polymers, in fact they are literally bullet proof, and are mounted to with stand an 80 mph crash and 8G force in all directions. Gasoline tanks are formed out of a very thin sheet metal and are much more subject to leaks. In spite of being highly pressuring, CNG is much less explosive than LPG or even gasoline. NG is lighter than air and rises if a leak occurs; gasoline however pools on the ground and is more subject to ignition. Most all home and business heating and cooking appliances utilize NG because of safety, dependability and cost effectiveness. NG is the safest, cheapest, cleanest burning and most abundant fuel available in the market today. In some countries over 50% of vehicles use NG as transportation fuel and have dramatically reduced their dependency on foreign oil.


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