What is the trade-off involved with shopping at a convenience store?

The biggest difference in services between a grocery and convenience store is that the latter usually sells gasoline. About 80 percent of convenience stores sell gasoline and these stores accounted for approximately 80 percent of gasoline sales in the United States annually according to "NACS" magazine in February 2011.

Grocery stores tend to be larger in size than convenience stores with an average size of 46,000 square feet. The average convenience store is 4,700 square feet -- 2,800 square fee of sales area