Hi. I got a 55 plate Wee. From tank filled to just under the brim, to when the last bar starts blinking (its when I reset the trip meter) is usually around 170 to 180 miles depending on weather. Colder days, I let the engine warm up for bit while putting the helmet and gloves on. This equates to 15.something Litres.
I don't pootle about BTW.
Hope this helps.
Kris