Question about Convenience Store Products

As I've mentioned on my intro thread , I'm thinking about getting into the convenience store/gas station business ,which is why I have a question regarding the sort of products that bring in the money at such places .

I know that junk food , soda , lottery tickets , etc. , bring in a lot of money for this type of business , however there may be a few other bread and butter items I may be overlooking . Does anybody have any experience with what sort of underrated bread and butter products are important for a convenience store's revenue ?

Thanks ahead of time .