"Service Lets Drivers Lock In Gasoline Prices"
http://www.nytimes.com/reuters/technology/tech-mygallonscom.html?_r=1&oref=slogin
A recently introduced service called MyGallons.com allows drivers to fill up their tanks sometime in the future but at current prices, using a debit-like card which banks gallons rather than dollars.
...
The risk to the consumer is if price of gasoline in the future becomes cheaper rather than more expensive. But if members are dissatisfied, they can drop out of the program and receive a lesser of the current price or what they paid as a refund.
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There it is. The "tell" of the market speculators.
Most people simply call it greed.