gas prices

[Sam Leon]

This is a bit off topic but as landlords we try to save on gas driving from property to property.

Right now gas prices are trending low and may stay that way for a bit or it seems.  I found this web site that allows you to pre-purchase gas at a "current price" by the gallons and cash in later...so essentially you can buy say 500 gallons of gas at $2.50 a gallon and have it loaded on a card, and wait six months, if the gas prices go up you can save a bit by using your gas card purchased with past prices.
http://www.mygallons.com/account/programs_and_pricing/

Anyone familiar with this company?  If so would like to get some feedback.  I haven't created an account yet and there is an annual membership fee $30 and pre-purchase processing fee of 6% to participate.

Now what if they go out of business in six months?

Any other sites or resources for similar ideas?  Basically a way to lock in today's gas prices?