The Shell Fuel Rewards Network (FRN) is running a promotion now through August 4th, 2014 where the first 1,000,000 new members to sign up will receive a 25 cent per gallon sign up bonus.

When you link your Total Rewards and Shell Fuel Rewards Network accounts, you will earn additional FRN discounts based on your play. You can read more about the Total Rewards / Shell FRN partnership in my Save on Gas with Total Rewards post.

UPDATE:
Total Rewards is ending its partnership with  the Fuel Rewards Program  on  May 31st, 2016