Sometimes, the old ideas are the best ideas. If your spring marketing plan is still in flux, free gas for a year isn't just a good prize, it's a great one. You can talk with us about how the computation works, but there are few promotions that will resonate as nicely as this one. With regular gas blowing past the $2 gallon threshold, this giveaway (and related ones, like "Free Gas Fridays," et. al.) is especially timely. Thanks to Bill Jacobs for reminding us of the obvious.