Particularly when you look at power cables used for car audio amplifiers and their routing through tiny spaces. 10 AWG and 8 AWG are pretty common in this scenario.

I have a 10 foot USB extension cable on my 2.1ah 5v Apple USB charger for my iPad mini ... Long extensions, like this one, may even use 20 AWG power and 24 AWG data. 20 AWG = 10.2 mOhm/ft 24 AWG ...

Illustration courtesy of Southwire Industrial Power Cables. Currently, manufacturers of multi-conductor cable assemblies such as Type TC and MC cables ... are increased to a 2 AWG, Type XHHW, copper ...