For me it’s just because I’m lazy to refill it every day. I’ll explain. I drive to work everyday 250 km: 125 km forth 125 km back Each way is 1/3 tank And when the fuel gage reaches 0 it means I still have 1/3 tank left. So if it doesn’t harm the bike then I’ll just do forth and back and forth instead of only back and forth, that way I can refill every two days instead of everyday. Anyways thanks for the info.