Which expressway is cheaper from Chengdu to Yibin?

Chengdu to Yibin is cheap by taking Rongzun Expressway. Chengdu to Yibin takes Rongzun Expressway, and at Bao Fei overpass, it changes to Yizhao Expressway, with the least toll and the shortest driving time. Toll, 78 yuan. Take Rongzun Expressway all the way, and finally take Yin Kun Expressway. The mileage is a few kilometers short, the toll is expensive in 38 yuan, and the time spent is the same.