You know what you do sell. You know what you can sell. You will find out what some of the product areas are that are niches you can fill. I've always felt the ultimate customer was the vehicle. But a human being has to be convinced to come to your store to buy products and accessories.
Chains pay attention to demographics.
If you can't answer these questions, you don't know your customer. We must know our audience so we can develop a message. Chains carefully hone their message to reach demographics. Nobody's in a better position than you are to know these demographics. I may have in 5 miles a million people.