Link Tecnhologies Inc. is a full line distributor, service and installation center for Technocarb alternative fuel conversion systems.

 Most phone calls we receive about alternative fuel conversions consist of the same set of questions. Below is the basic information about alternative fuels including a detailed comparison between CNG and LPG.

 SAVE 40% TO 50%

 As of today 7/19/2012, The local (OKC,OK) cost of propane motor fuel is $1.69 per/gallon and CNG is $1.39 per/GGE (Gas gallon equivalent) <<<<{We will get into that later}. Switching to alternative fuel can save thousands of dollars annually. There are also state and federal tax incentives that will credit you for a percentage of your conversion and the fuel usage as well. At less than half the cost of gasoline, how long will it take you to pay for your conversion and start putting that money back in your pocket?


 We have a large domestic supply of both CNG and LPG right here at home. Reduce our dependency on foreign fuels and create American jobs. Recent advances in drilling techniques have greatly increased our supply. Since propane is a product of natural gas (sometimes referred to as the high ends or natural gas liquids), as long as we produce natural gas, we produce propane.


 Fewer smog-producing hydrocarbons, less carbon monoxide, less nitrogen oxide, less carbon dioxide. Shrink your environmental footprint substantially by switching to CNG or LPG. Both fuels will also prolong the life of your engine since they burn much cleaner than gasoline leaving behind much less residue to build up on internal engine components. You will still need to change your oil at the manufacturers specified intervals, but you will notice that your used oil is much cleaner than it ever was using gasoline.


 Technocarb also offers a CNG or LPG injection system for diesels. These upgrades can increase you mileage and horsepower by up to 30%. Have a newer engine with a DPF (Diesel Particulate Filter) ? The Eccodiesel system burns the particulate in diesel fuel to increase the efficiency and power of your engine which in turn decreases the amount of particulate in your exhaust. This means longer times between regen cycles, urea fill ups, and possible filter replacement.


 That concludes the section of similarities between LPG and CNG. Now for a detailed comparison of these two fuels.




(the truth)

Though we install both, propane (LPG) and compressed natural gas (CNG) are not as comparable as some would like for you to believe.


 LPG conversions are half the cost of CNG conversions. An LPG system will run anywhere between $4000.00 and $6500.00 installed, depending on amenities, tanks etc. The CNG systems range from $8500.00 to $12000.00 installed. The cost of implementing a propane refueling station is generally one-tenth of the cost of a comparable CNG station. Most propane dealers will gladly set a fully assembled motor fuel dispenser at your location for a small rental fee and sell you the motor fuel with your tax credits already factored in. The savings in energy usage involved in storing and pumping the fuel is also noteworthy. An LPG fueling station will use approximately 90% less electricity than its CNG counterpart.


 LPG can be found at almost every truck stop, many gas stations and most equipment rental companies coast to coast, not to mention all the propane dealers. CNG fuel is becoming more available, but with its limited range it will be a long long time before its comparable to propane's readily accessible status. According to CNG Locator, there are 28 CNG fueling stations in the entire state of Oklahoma. According to there are 26 LPG stations within 50 miles of Oklahoma City, 12 in Oklahoma City.


 Propane has a narrower flammability range than compressed natural gas. Propane vehicle tanks have a working pressure of 312 psi. Natural gas tanks have a working pressure of 3,600 psi. Though both fuels produce greenhouse gases when burned, LPG is not a greenhouse gas in its natural state. The downfall of this is that LPG is heavier than air and will settle to the ground and collect in low areas. CNG will be dispersed into the atmosphere in the event of a leak or accidental release.



 We quite often hear people comparing these fuels based on their respective octane ratings. I'm sure there is no relation between this erroneous comparison and the fact that CNG has the highest octane rating of all these fuels..?..?..? Both CNG and LPG have a higher octane rating than the highest grade of gasoline available. First lets define octane rating and what it does for you.

  Wikipedia - Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating. In broad terms, fuels with a higher octane rating are used in high-compression engines that generally have higher performance.

 So the higher the octane rating, the less likely the fuel is to pre-ignite in high compression engines causing them to knock. Now lets talk about the real factor when comparing these fuels to one another. BTU content.

 Wikipedia - BTU is used to describe the heat value (energy content) of fuels, and also to describe the power of heating and cooling systems, such as furnaces, stoves, barbecue grills, and air conditioners. When used as a unit of power, Btu per hour (Btu/h) is the correct unit, though this is often abbreviated to just "Btu".

 Change in horsepower and mileage are directly proportional to the fuels BTU content. Not octane rating. Below is a chart comparing gasoline, LPG and CNG using the exact same tank (16" x 36") in a 20mpg gasoline engine. Since both LPG and CNG have less BTU content than gasoline the corrections in mileage will be used based on the percentage of each fuels content. Gasoline and LPG will be compared in liquid gallons as gasoline is never a vapor, and the LPG/CNG comparisons will be based on cubic feet of vapor as CNG is never in a liquid state. The first column in our chart is labeled Gallon/GGE. GGE stands for gas gallon equivalent. This number is related to BTU content as well. The number for CNG reflects the comparable amount of CNG to gasoline you can get in this tank pressured to 3600psi.

Gallon/GGE Vapor Cubic Ft. BTU per Gallon BTU per Cubic Ft. Mileage Range
LPG 22.19 @ 80% 807@312psi 91690 2500 18 MPG @ -10% 399.42 Miles
CNG 6.9 GGE 850@3600psi N/A 1200 20 MPG/GGE 138 Miles
Gasoline 27.74 N/A 100250 N/A

20 MPG

554.8 Miles

 Made up your mind yet? I have one last tidbit for you to mull over. Based also on BTU content, you will experience a loss in horsepower. -10% approx. with LPG and -25% approx. with CNG. If it seems like we are bias, that is because we are, based solely on the facts and not the politics. CNG is abundent and has its uses even as a motor fuel in certain scenarios. There are even CNG specific engines being produced that can overcome some of these disadvantages. As for conversions on gasoline engines, unless you have a short run fleet or are in close proximity to a CNG refueling station while on your travels, CNG may not be for you. The decision is yours. 





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