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The real problem here is how do you tell when prices are cheap? For instance, not that long ago it was around $4/gal, then dropped to $3. That's cheap, right? So if you bought a bunch of cheap $3 gas, you'd have missed out when it went below $2.50.
OTOH, if you really can reliably forecast price changes, you should get a job on Wall Street and not have to worry about the cost of a few gallons of gas :-)
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