I agree the calcs are light, about 40% light by my guess. I figure he may have begun writing the article prior to the last news release. It certainly does highlight how we can be amply rewarded by staying the course to the end though.
As far as the book referenced, I ordered it and it just arrived today. Something to read on vaccation:). I have long thought Aubrey must have read this book also. He seems to be setting up the same scenario.
Ed