Extra Total Rewards Gas Savings

Total Rewards is doing a short-term promotion where you can earn 20¢ off per gallon at Shell for every 500 Tier Credits earned instead of the regular rate of 10¢ off per gallon. The promotion runs August 19-28, 2013.
See my Save on Gas with Total Rewards post for more info on the Total Rewards / Shell Fuel Rewards Network program.