This paper examines how the service atmosphere affects consuming behaviors in gas stations. We conduct an experimental research to measure the effect of the atmosphere on customers' expectation of service quality and on purchasing intention at the gas station services. This research also explores the moderating effects of the number of service employees and the waiting expectation on the anterior relationships. The results show that the better gas station atmosphere results in higher service quality expectation and purchasing intention. These effects are stronger in more number of service employees and for shorter waiting expectation.