If you want to be sure you save the most money on your grocery bill, then look at your receipt! I can't tell you how many times I have been charged wrong for something. Usually it is a $1 or less, but this past week I was over charged by more than $7.00 in 1 transaction. I didn't catch it until I got home. I did go back and they graciously refunded me my money.
I want to encourage you to practice these 3 habits!
Always make sure you are charged the correct price!
Always make sure you receive the coupon value due!
Always check your receipt BEFORE you leave the store!
Getting in the habit of practicing these 3 things will definitely save you money!