Shop at participating grocery stores, retailers, and inside Shell convenience stores among other places and you will earn rewards on your card that add up to cents off your Shell fuel, the next time you fill up.
With fuel prices rising almost daily, this is a nice reward program! Currently only in CA, FL, GA, NC, SC, LA, TN, IL, WI, OH, MI, KS, IA, MO, PA, MN and NV, but expanding daily.
I won only 5 cents off of my fuel bill, but heck, it's better than no savings at all. If you happen to be traveling in any of these states, it might be worth looking in to.