is it possible the LEDs draw even less than 1,1V?
Wrong use of words. Current is drawn, voltage is dropped. Typical is a word that covers a number of sins but I would expect about 10% variation with temperature and 40% with life time.
The point is that a design that relies on undefined values is not a good or stable design, in other words you are not in control of what happens you are a hostage to fortune.
can i get little more than 100mA from my usb port without setting anything?
Yes 100mA is the default maximum current rating for a USB device. In the device's parameters it can say that it can request up to 500mA but in the absence of anything it's 100mA.