Feedback please - these VD calculations to determine the need for 3/0 conductor is based on a 100A draw - in truth this panel will not be pulling 100A...prob. won't even be pulling 90A....if you use 90A in your calculation your conductor size drops to 2/0. Not only does this lower the matl. cost it sure makes pulling into that 2" conduit a lot easier. My opinion is this: if you're going to be pulling more than 80A from a 100A panel, you should be upsizing it to begin with.
