I really do appreciate everyones opinion.
However, I do not intend to use #4 or #6 wire for the feed to my sub-panel.
The very smallest wire I would consider is #2 and because of the length of run I have, I feel it may be undersized.
Below please find my original request so that the answers...
I would appreciate some advise on the size of power cable I should run to a shop. The distance from the main house panel to the shop (cable length) will be about 160 ft. I want to run aluminum feed cable for a new 100 amp panel in the shop. The cable will be buried and in 2 inch pvc conduit...