In real money, if you add 60% of a 77kWh battery (20-80%) that’s 46.2 kWh added. That will cost you £24.41 for that charge at 55p.
Assuming a fairly standard 3 miles per kWh, adding 46 kWh will return 136 miles.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark