Replies to This Discussion

Permalink Reply by Parkdota on April 16, 2011 at 2:42

Wow....gotta love this pic.  Only wish all the stations had cng.

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Permalink Reply by P.G. on April 16, 2011 at 5:20

Seems like the fastest way to cng would be to require public utility companies who distribute NG to install public access points.. That would fill in the gaps that exist across the nation...

As usage increased, private companies like convenient stores would come on line..

 

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Permalink Reply by Bacon on April 16, 2011 at 9:50

Disclaimer: That's current prices in CA with a little photo enhancement to add the CNG. :)

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Permalink Reply by Keith Mauck (Site Publisher) on April 18, 2011 at 3:29

Thats great.

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Permalink Reply by Mac Davis on April 16, 2011 at 12:16

In places where they DO sell CNG for vehicles, what unit is CNG priced in?  MCF?  MMBTU? 

 

The sign above seems to be priced in "dollars per equivalent to a gallon of gasoline." 

 

I'd hate to see the US consumer refuse to use CNG because the price for 1 MMBTU is higher than the price for a gallon of gasoline, even though it takes you much further than a gallon of gasoline.

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Permalink Reply by king john on April 18, 2011 at 2:33

i found this conversion chart.

Table of GGE

Fuel	GGE	BTU/unit
Gasoline (base)[2]	1 US gallon	114,000 BTU/gal
Gasoline (conventional, summer)[2]	0.996 US gallon *	114,500 BTU/gal
Gasoline (conventional, winter)[2]	1.013 US gallon *	112,500 BTU/gal
Gasoline (reformulated gasoline, ethanol)[2]	1.019 US gallon *	111,836 BTU/gal
Gasoline (reformulated gasoline, ETBE)[2]	1.019 US gallon *	111,811 BTU/gal
Gasoline (reformulated gasoline, MTBE)[2]	1.020 US gallon *	111,745 BTU/gal
Gasoline (10% MBTE)[3]	1.02 US gallon	112,000 BTU/gallon
Gasoline (regular unleaded)[4]	1 US gallon	114,100 BTU/gal
Diesel #2[4]	0.88 US gallons	129,500 BTU/gal
Biodiesel (B100)[4]	0.96 US gallons	118,300 BTU/gal
Bio Diesel (B20)[4]	0.90 US gallons	127,250 BTU/gal
Liquid natural gas (LNG)[4]	1.52 US gallons	75,000 BTU/gal
Compressed natural gas (CNG)[4]	126.67 cu ft (3.587 m3)	900 BTU/cu ft
Hydrogen at 101.325 kPa	357.37 cu ft	319 BTU/cu ft[5]
Hydrogen by weight	0.997 kg (2.198 lb)[6]	119.9 MJ/kg (51,500 BTU/lb)[7]
Liquefied petroleum gas(propane) (LPG)[4]	1.35 US gallons	84,300 BTU/gal
Methanol fuel (M100)[4]	2.01 US gallons	56,800 BTU/gal
Ethanol fuel (E100)[4]	1.500 US gallons	76,100 BTU/gal
Ethanol (E85)[4]	1.39 US gallons	81,800 BTU/gal
Jet fuel (naphtha)[8]	0.97 US gallons	118,700 BTU/gal
Jet fuel (kerosene)[8]	0.90 US gallons	128,100 BTU/gal
Electricity	33.40 kilowatt-hours *	3,413 BTU/(kW·h) [9][10]
*calculated based on 114,000 BTU/gal base gasoline

 

i still don't know how cng is marketed to the driving consumer, in terms of a "unit". i did read that under different physical conditions,( temp/pressure) , the GGE can change.

kj

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Permalink Reply by Bacon on April 18, 2011 at 2:43

I saw where Boone said that the CNG equivalent of a gallon of gasoline was $1.40 or so. I went with it.  Your chart seems a lot different than that though.

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Permalink Reply by Les Bamburg on April 18, 2011 at 3:34

KJ, just realize the values shown above are generally net (or lower) heating value but energy is bought and sold on a gross (or higher) heating value basis.  Also, because most of the commodities shown are mixtures of components their actual heating value can vary, especially CNG and LNG. 

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Permalink Reply by Les Bamburg on April 18, 2011 at 3:14

Mac, generally you see CNG prices quoted on the basis of gasoline gallon equivalent (GGE) at stations.  Home use would likely be measured and priced on "therms" which is equivalent to 100,000 Btu's.

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Permalink Reply by Jeff Ferreira on April 18, 2011 at 4:04

I will take the $1.39 for sure

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Permalink Reply by P.G. on April 18, 2011 at 4:57

Be nice if they could come up with a BTU usage per mile average for cng versus gasoline for various vehicles

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Permalink Reply by Les Bamburg on April 18, 2011 at 8:11

PG, generally CNG and gasoline usage should be the same on a Btu/Mile basis because the two fuels have the same efficiency in a spark ignited engine.  For existing CNG light duty vehicles the fuel consumption is estimated at about 4,969 Btu per mile on a gross basis.  

 

When CNG is compared versus diesel it requires ~ 11% more energy due to the lower effiency of spark ignited versus diesel engines.

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