省到水電：Bal b/f TW$4,380+TW$365=TW$4,745 Bal c/f
23,971KM-2KM=23,969KM
https://www.google.com/amp/s/udn.com/news/amp/story/7315/8456131
省到累積：Bal b/f TW$21,771 +早餐TW$0 +午餐TW$0 +晚餐TW$8 +當天用膳共少於240台幣可得TW$80 +不約人用膳TW$80 +當天成功