Whether it's your gas tank or your stomach, you can fill up at allsup's. allsup's convenience stores operates about 315 locations in small towns and along roadsides in new mexico and texas. the company's stores offer hot southwestern-style foods, such as burritos and barbecue, as well as other food items and traditional convenience store fare, including cigarettes, snacks, and sodas. exxon, fina, conocophillips, and shell brand gasoline is also sold at allsup's locations. cutting horse aficionado lonnie allsup opened his first convenience store in roswell, new mexico in 1956. his family continues to own and run the company.