I am not sure there is one specific best offer that I can report to you. This is primarily due to the each stores different menu items, price points, demographics, locations, etc. Of course very aggressive deeper discounted offers have high redemption rates. We do see coupons offering FREE items get a good response and reasonable combo deals with items that pair well together work very well. If you want to email me your menu I can give you some specifics examples.
Also if you are interested here is a link to a blog post on our website that talks about the importance of diversifying your coupons. I think you will find it informative.
