Group 1 - The article highlights the importance of customer service in differentiating businesses, especially in competitive environments like gas stations [2] - The gas station at Jinan Refinery has successfully attracted high-end customers by providing attentive service, such as offering water and assistance during hot weather [1][2] - The customer, who is a company executive, expressed satisfaction with the service and decided to establish a regular relationship for fuel and car wash services [2] Group 2 - The gas station has introduced a new car wash service using imported wax that protects the car's paint, which impressed the customer [1] - The article emphasizes that in today's business landscape, the quality of service can significantly influence customer loyalty and repeat business [2]