I guess its 3.5 to 4 litr tank
It is pretty comfortable but since i use it on paved roads around my house for short runs i am not the right person to answer
Company marketed this bike with a boy picture riding it then a girl .seperately..unisex. but no girl can get this scooter on its double stand for sure. Side stand is not so good. For women united scooter is better.
What worries me is i see very young kids on this scootr in my area.this is not a toy.it has a proper 70cc engine n can b fast dangerous n unstable