Is it cost-effective to drive from Chengdu to Sanya alone?

Not cost-effective. According to Baidu map, Chengdu is 23 hours and 25 minutes away from Sanya 194 1 km. It takes a long time to drive, consumes a lot of fuel, and needs to pay extra fees such as tolls and parking fees. Self-driving also has traffic safety hazards and fatigue driving problems. Compared with flying or train, the cost and risk of self-driving are relatively high and uneconomical.