Frequently Asked Questions
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    What is CNG?

    Compressed natural gas (CNG) (Methane stored at high pressure) can be used in place of gasoline (petrol), Diesel fuel and propane/LPG. Compressed Natural Gas is simply natural gas compressed to a higher PSI (typically 3600 PSI). Natural Gas is also used in to heat many homes today.

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    Can I run CNG or LPG on my specific vehicle?

    Yes! Most combustion motors can be converted to run on CNG or LPG as a fuel.  Gratec stocks both premium sequential kits for gasoline vehicles as well as high quality diesel dual fual conversion kits for diesel motors.  There is currently one type of motor that we cannot convert to CNG and that is a direct injection motor.  Very few motors on the market are direct injection and there is currently no solution on the market for this engine; however our R&D team is working on a solution.  Every other vehicle or engine can be converted!  Does your vehicle use premium unleaded gas? No problem! CNG & LPG have octane ratings that exceed premium unleaded octane rating!

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    There are many conversion kits on the market, how do I select the right one?

    Most of us spend some time in our vehicle and rely on it to take us from point A to point B.  Finding a good conversion kit is not only going with a reputable company it is so much more.  The components that make up the conversion kit must be of high quality.  Low quality parts can cause damage to your engine.  Cheap kits are not the way to go.  The saying “you get what you pay for” is very true in the conversion kit industry.  When a system is developed it must have a strong ECU processor to be able to handle the quick reaction time of your OBD-2 system.  Each part of the conversion system you want to be good quality so it can last as long as your vehicle. Gratec stocks only high quality parts, kits and accessories.  Gratec kits will NOT come with the common 6mm tube that comes in a coil that has a burst pressure less than NFPA-52 standards.

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    Is CNG/LPG really safer than gasoline?

    Of course each system is only as safe as the quality grade of components used and the quality of the installation. Gratec always recommends conversion kits be installed by certified CNG or LPG mechanics. CNG is much safer than gasoline due to the fact it is a vapor.  In the event of a leak or accident the gas will vent off and dissipate into the atmosphere. The air/fuel ratio of CNG is smaller than gasoline which means it takes a perfect air/fuel ratio to ignite.  LPG however is a more dangerous fuel than the alternative CNG.  Gasoline, being a liquid is very dangerous in a car accident and is responsible for many auto fires.

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    Where can I refuel my CNG or LPG vehicle?

    There are many public CNG & LPG station located throughout the USA.  For more information on  the closest public refueling station to you and their cost per gallon please visit  If you are not looking for a public fill station you may also have the option of filling up in your garage!  Home fill units are available for CNG vehicle customers who have a natural gas supply line going into their home.  LPG vehicle customers who have propane heating their home may also find the propane dispensing unit to be a more convenient and cost-effective solution.

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    How much will I save by switching to CNG or LPG?

    Depending on how many miles you drive per year the cost savings can be great! To determine the cost savings for you please see our savings calculator located here on our website.  On average CNG can be up to 2x less than gasoline per gallon; most people see their fuel bill cut in half when switching to CNG. Greater savings will be seen if using a home fill unit! LPG, or propane, can vary greatly in price depending on season and availability in your area.  For more information please check out propane prices via the tab above.

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    Can installing a CNG or LPG system hurt my vehicle?

    As we have previously discussed, when a system is installed properly using good quality components your vehicle will not be hurt.  CNG and LPG will actually clean your motor since they are such clean burning, high octane fuels.  It is very important to purchase from a company with a great service team, technical support team and selling high quality components.  Gratec not only has an award winning service team but has a technical support department that will aid you or your installer through a perfect installation process.

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    How does your CNG or LPG system work on my gasoline vehicle?

    Our sequential injection CNG or LPG conversion system uses only the latest technology advances to guarantees your vehicle runs on the alternative fuel just like it does on gasoline. Our system is a fully automatic system that will automatically switch to CNG once all engine parameters are sufficient.  Once your alternative fuel tank runs empty our systems will seamlessly switch you back to gasoline and alert you via a beep from the switch. Our systems contain many safety features which continually watch your engine and the operation of the alternative fuel equipment.  In the event a problem is detected the system will immediately switch your vehicle back to gasoline. All our systems are bi-fuel systems which means you will have the option of driving on gasoline supply or the alternative fuel supply.

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    How does your CNG or LPG dual fuel system work on my diesel engine?

    This is our latest addition to our CNG/LPG conversion kits.  We have now engineered a top diesel dual fuel unit that is available on the market today. Diesel engines, because they have no spark plugs, use compression to ignite their fuel. Due to this there must always be some diesel running the engine to cause the ignition which in turn ignites the alternative fuel additive. This is why it is called a dual fuel or fuel blended mixture. Choosing the correct diesel dual fuel kit is a process that cannot be overlooked.  Some “fogger” style diesel kits do not monitor mixture, exhaust temperature or other OEM engine parameters.  This is very dangerous for your engine and can lead to engine failure.  Our fully electronic system monitors necessary OEM sensors, mixtures, exhaust temperature, diesel injection time, TPS, air flow and much more to keep your engine running the best possible mixture (saving money) and running safely at all times. In the event your exhaust temperature rises our dual fuel system will automatically turn the CNG/LPG system off until the temperature falls below the set safe value. Our system again is fully automatic and will switch to and from the alternative fuel all automatically. Finding a good diesel dual fuel kit is a necessity!

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    Do your conversion systems come with technical support?

    Yes! Gratec has an award winning technical support department that is here to answer all your questions! From general installation of the system to the tuning process, Gratec technical support is here to help.  To reach our technical support department please email or call 918-236-3983.

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    Does my state offer a tax credit for converting my vehicle to CNG or LPG?

    State tax credits will vary from state to state. To have one of our staff members research on if your state offers the state tax credit please call us directly and we will be glad to research this for you.  The State of Oklahoma currently offers a 45% state tax rebate on the cost of the installation when the installation is performed by a State Certified Company & Technician.

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    Will I loose torque and horsepower when switch to CNG or LPG?

    For Gasoline Engines – To generally answer your question no you will not notice a torque or horsepower loss with our sequential injection gasoline system. When the system is ran on a dyno you are able to see a slight torque and horsepower loss when running the alternative fuel.  This is mainly due to the fact that your vehicle is tuned to run gasoline and we make the CNG/LPG system adapt to the gasoline paramters not changing any OEM specs. Due to this we see these slight decreases. If you pull heavy loads with your vehicle and need the extra power our system is designed to use a limited amount of gasoline only when your engine needs the extra power (this feature can be enabled or disabled in the software).

    For Diesel Engines – Due to the fact you are increasing BTUs in the engine we are seeing a rough gain of 5-10% increase in both horsepower and torque while achieving a nice mixture. Beware of conversion systems who offer more than this increase.  The larger your increase is the less fuel you are saving. If you are desiring more of a torque and horsepower increase and less of an actual fuel savings this can be manually adjusted in the software. Our system comes setup with a fuel savings strategy!

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    When I purchase a new vehicle can I remove the system from current vehicle and install on new vehicle?

    Yes! The only thing you will need to verify is the number of cylinders! The system will then need to be re-tuned to your new vehicle and thats it! You now have your new vehicle running on the same system purchased for your old vehicle!  Most of the time people will sell their old vehicle with the CNG/LPG system on the vehicle because it increases the value of their vehicle!


  • Gratec is a company that provides excellent support and after install service. Any product they offer i trust that their engineering team has determined it is of great quality and good enough to stamp their name on.  If Gratec says it is good I say it is good too.  They have an awesome team and truly are the best in the business!

    Mark P
  • The Versus system has been a great investment for my truck and the technical service received from Matt was fantastic. He was always quick to respond to my calls and texts and help me through any issues I had during installation. I will be purchasing another system from him with my next vehicle.

    Zach Worden
  • In regards to the Versus Kits – our team expended much time and effort to narrow down CNG bi-fuel kit manufacturers that we would feel comfortable selling to clients and installing on their vehicles. We graded manufacturers kits based upon quality, warranty issues, dependability, plug & play as a mandate, access to American technical support and next generation R&D efforts.

    Keevin Larson
    VP Penn CNG Solutions, Inc
  • I purchased some CNG injector adapters for a no drill into my intake manifold install. However after receiving the product and attempting to install the items didn't fit my application. So I emailed Mathew and returned the items. Really easy and simple no catches. Return was what I expected per the terms of the agreement and purchasing. No arguments or hassles. I would and will in the future use versus products and this company again. Having a good product is one thing, but when a problem comes up that's when you can tell how well a company is trained and if they actually care or not. Versus was tested by me and passed. I had a problem and it was resolved in a professional and kind way.

    Darrin Ferguson
  • I have had the Versus Gas USA system running on my daily driving vehicle for over 50,000 miles without any issues.  This is one of the main reasons why we are now promoting Versus Gas equipment.  I can tell you first hand that the system works.

    Michael Graham
    CEO Gratec LLC