> Propane serves at present, in my area. As you say, it is currently the 
 > cheapest thing available, But in time it will not be so cheap. Indeed, the 
 > time will come when it is not available at all. That is why it is called 
 > 'non-renewable'. And who is going to let us know when we're nearly 
 > out? 
We have more known reserves of oil now (measured in years) than we did in 
1950. So yeah, it ain't renewable, but we ain't running out either.
And, the price will tell you if we are "nearly out".
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