Okay gents, i'm not really new to the debate topics of renewable energy

as I've been an avid follower of alternative options (except Ethanol).

I'm a Chicago burbs resident, so I've already checked the local listings

on the energy site for local stations, not very many.....so here's my question.

I noticed people use Pressure ratings and GGE measurements with CNG.

What I'm trying to figure out here is how I can do the math to convert say

my gas bill charges into these GGE's or whatever I can do in essence to

determine my OVERALL costs, then break it down by my annual mileage to

get an educated guess on what my MPG would be overall and break even point.

This is what I was told so far, please correct and add in as needed.

My Gas bill comes rated in "Therms" so I am trying to do the math conversion

here to find out what is a GGE in relation to this - This is what I was told by

a buddy who works in energy but there's obviously parts missing.....

I read that 1 GGE is the gasoline gallon equivalent, so how do you get a GGE

rating plus PSI rating .....I guess that's where I'm getting lost at.

This didn't really help much....maybe I'm just brainfarting it http://en.wikipedia.org/wiki/GGE

So the pressure compresses the gas more but it's still 1 GGE ....right ???

Meaning higher PSI equals less cubic feet per GGE but still the same energy as 1 gallon of gas.

For instance, can someone use a 2008 Honda GX max GGE and what PSI rating, and explain it to me ??

as I've been an avid follower of alternative options (except Ethanol).

I'm a Chicago burbs resident, so I've already checked the local listings

on the energy site for local stations, not very many.....so here's my question.

I noticed people use Pressure ratings and GGE measurements with CNG.

What I'm trying to figure out here is how I can do the math to convert say

my gas bill charges into these GGE's or whatever I can do in essence to

determine my OVERALL costs, then break it down by my annual mileage to

get an educated guess on what my MPG would be overall and break even point.

This is what I was told so far, please correct and add in as needed.

My Gas bill comes rated in "Therms" so I am trying to do the math conversion

here to find out what is a GGE in relation to this - This is what I was told by

a buddy who works in energy but there's obviously parts missing.....

124 scf = 1 gallon of gasoline.

124 scf= 1.24 therm

1 therm = (about) $1.30 to $1.40 for June delivery in Chicago.

1.24 * 1.35 (avg) = $1.67

Fuel efficiency loss, figure about 3 MPG less on CNG. I have seen studies that showed anywhere from 12 to 35 percent less fuel mileage with CNG depending on the vehicle.

124 scf= 1.24 therm

1 therm = (about) $1.30 to $1.40 for June delivery in Chicago.

1.24 * 1.35 (avg) = $1.67

Fuel efficiency loss, figure about 3 MPG less on CNG. I have seen studies that showed anywhere from 12 to 35 percent less fuel mileage with CNG depending on the vehicle.

rating plus PSI rating .....I guess that's where I'm getting lost at.

This didn't really help much....maybe I'm just brainfarting it http://en.wikipedia.org/wiki/GGE

So the pressure compresses the gas more but it's still 1 GGE ....right ???

Meaning higher PSI equals less cubic feet per GGE but still the same energy as 1 gallon of gas.

For instance, can someone use a 2008 Honda GX max GGE and what PSI rating, and explain it to me ??

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