one unit of mains electricity, which is just a bit over HK$1.0? Isn't HK$7x.- rather cheap for going some 500km (about 300 miles)???

https://www.scmp.com/business/companies/article/3117106/chinas-ev-war-tesla-faces-rival-record-621-mile-range-nios-et7

"...has a range of 500 kilometres using a 70 kilowatt-hour (kWh) battery pack"