I use "GetUpside" app to save on Gas, Groceries & Restaurants (Cell phone app only). They ask email account to signup. (fake email works too since no activation required). You can use code "FMB9E" if it asks.
Save $0.25/gallon on Gas
Save 15% on Groceries & Restaurants (only DC & surrounding area)
Money you save can be moved to Paypal account or gift card or get a check mailed to your address. No minimums to cash-out.
This app is currently only in Maryland, Virginia, Long Island, North Carolina, South Carolina, Delaware, Florida, and Washington DC areas.