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Old 03-31-2011, 06:51 AM
wulfman wulfman is offline
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CNG WORTH DOING FOR BETTER MILEAGE

What do yall thing about compressed natural gas. I have heard it will extend fuel mileage a lot , is it worth the expense and will it hurt the engine.
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Old 03-31-2011, 07:53 AM
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there is another thread speaking just to that in the Ex forum here:
http://www.ford-trucks.com/forums/10...tural-gas.html

my only take is since T Boon and the gooberment is pushing it, it MUST be great for us!

(and this comes from someone getting regular gas royalty checks - that the gov't gets income tax AND property tax on !!!!)


but seriously - in all of the dfw area there are only 7 stations for over 4 million people.... wonder how few and far between they are in the boonies ?
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Old 04-02-2011, 12:50 PM
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You're asking about diesel-CNG dual fuel systems. CNG will extend (improve) your fuel economy because it is a way of substituting high cost diesel energy with low cost natural gas energy. There doesn't appear to be any public CNG stations in Knoxville and the closest station (Wartburg) appears to be selling CNG for $1.50/GGE. The price of CNG in DFW is about $2.35/GGE. However, there's a net federal CNG tax credit of $0.317/gallon, which means the net price for CNG is $2.03/GGE. Similarly, in Buffalo, NY, CNG is selling for $1.28/GGE or $1.09/DGE net.

A GGE has about 88% of the energy of a Diesel Gallon Equivalent (DGE) so the $2.03/GGE is really about $2.31/DGE. This means that you would be saving about $1.15/gallon in terms of diesel fuel (assuming $3.46/gallon diesel), but the amount you would save depends upon the amount of diesel fuel being substituted. You need to have an electronically-controlled CNG fuel system that can safely maximize CNG consumption to minimize your fuel costs.

To answer the OP's question - it's only worth it if you drive enough to pay back the cost of the conversion reasonably quickly. Depending upon the size of CNG cylinders used, a good diesel-CNG system will cost about $5-6000 installed. It won't hurt the engine if you use a good aftermarket injection system. Economy fumigation systems only have limited control over CNG delivery.

I've read reports of the substitution of 50-80% diesel fuel with CNG. See CNGchat Diesel-CNG. The Westport ISX-G engine uses a proprietary injection system to substitute 95% diesel.
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Old 04-02-2011, 04:23 PM
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Fraso thank you very much for your response i did not know they cost that much for the system, not cheap
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Old 04-03-2011, 01:40 PM
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Whether a system is cheap depends on a lot of factors besides the cost of the equipment. Let's pretend that your vehicle gets 15 mpg and you drive 30,000 miles/year. Diesel fuel will cost you $8,000/year @ $4/gallon and $10,000/year @ $5/gallon.

If you were to install a $6000 CNG system that substitutes 40% diesel and CNG costs $1.50/GGE ($1.18/GGE net), the payback on the CNG system will be about 2.8 years. If diesel goes up to $5.00/gallon, the payback becomes 2.1 years. If you do some dyno tuning with $4/gallon diesel and can now substitute 60% diesel, your payback becomes 1.9 years.

Instead of buying your CNG in Wartburg, let's say you live in Miami, OK where CNG costs $0.75/GGE ($0.43/GGE net) and you're substituting 50% of $4/gallon diesel, the payback is about 1.7 years. If diesel goes up to $5/gallon, the payback becomes 1.3 years.

Depending upon fuel prices, fuel consumption, annual mileage, installation cost, and substitution rate, a CNG system could actually be cheap.
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Old 04-03-2011, 01:40 PM
 
 
 
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