About 80-90% of distribution is tax deferred. Do not understand your other question since ETP is a partnership and at the end of the year you get a K-1. The K-1 allocates profits, interest income and other stuff. A simplified basic rule of thumb for cost basis is Cost +/- allocated profit/loss on line 1 of K-1, minus distributions paid.
PS- you cannot predict the numbers beforehand!
ARB