When considering the act of tipping a limo driver, how do I determine the appropriate amount that reflects both the quality of service and industry standards? Should I take into account factors like distance traveled, duration of the ride, or special accommodations made during the journey? In what ways does the level of service—be it exceptionally courteous or merely satisfactory—impact the final tip? Furthermore, are there specific conventions or guidelines that dictate customary percentages for tipping in this unique transportation context? Should one adhere to the general rule of 15% to 20%, or does the nature of the limo service, such as a luxury event or airport transfer, warrant a different approach? How do regional customs influence the expected gratuity, and is there a significant difference in how tips are perceived in urban versus rural settings? What is the best way to express appreciation for outstanding service while also staying within my budgetary constraints?