Gas stations have an unfair advantage. Unlike retail stores that only draw the frugal shopper with discounts and sales, or movie theaters that rely on showing the best films to get customers through the door, gas stations are frequented by the commuting public multiple times per month. The biggest challenge is getting those customers to come inside the convenience store to make a purchase.
For decades, pump-top advertisements and window posters have been used to point and lure people toward the c-store. When done correctly, these have proven effective tactics to increase in-store transaction rates.