Commercial natural gas has an energy content of about 1000 Btu per cubic foot while vaporized propane has an energy content of about 2500 Btu per cubic foot. Both come from natural gas. During processing, the heavier (and higher Btu content) molecules are stripped out of the gas that comes from the gas wells and sold separately at higher prices. What remains (mostly methane) is sold as natural gas.
The decision of how much of the heavier molecules are removed from the gas stream is an economic one. The processors of the gas will make little effort to strip the heavier molecules from the gas unless they can make more profit by doing so.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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