I would like to install a sub panel in my garage I was told to run 6/3 Romex to supply the sub panel and have done so. The run is about 65 feet and I am now wondering after reading this site what is the max I can get for this size wire? I plan to supply a compressor (20 amp) and the garden variety of home tools, circular saw (15 amp) are my to largest tools. O fcorse these won't be running at the same time.

That cable can provide a 60A 120/240v feeder.