There is no simple answer to your question. A statistic you may get is based on many, many instances/data points and may have no or little validity to your situation.

The number of people who stop is dependent on your competitors, your access/egress, the attractiveness of your site versus it competitors, what your offered is versus the competition, etc. The list of possible factors that influence a potential customer decisions is long.

You indicated that you do not intent to carry fuel. Gasoline availability is one of the primary reasons people select a c-store.

If you want to have a more accurate idea of how many cars will likely stop at your site, I suggest you hire one of the companies does site validation such as IMST Corp, out of Houston.

The single best source of industry data is the National Association of Convenience Stores (NACS). That being said, to access it you either have to be a member or be willing to pay a higher fee. Membership is $750 per year.

There are three basic ways you can try:

1) Get a wholesaler to carry your product. This is not an easy process as they are likely already carrying a similar product and given their economics they will not be anxious to carry another line unless if offer some form of differentiation. It also generally involves paying some placement fees.

2) You can hire a broker to rep. your product. The National Association of C-Stores (NACS) has a list of brokers via its membership directory. If you are not a member you can join for $750 per year.

3) You can use the direct sell model to larger chains in your area. If the chain accepts the product, they may request that their primary distributor carry it.