part 3 of 3: Alternatively, if you still felt it was necessary to use the virtual K-1s for the year of sale, I think you have a point. Then I would use $0 for proceeds and basis. Mark each as final. I think that each of these will result in the same tax. I have not experimented to make sure.
I should have mentioned that I did NOT sell in 2011. If fact, my plan is to hold for awhile - for the distributions / dividends. I am retired and supplement my income with dividends from stocks and REITs. I invested in several MLPs to diversity my holdings and to get some tax free (until I sell) distributions.
part 2. If you bought but did not sell, then see my suggested procedure on another recent thread. I suspect you saw it, and it may have seemed too complex. You may think it did not follow the rules rigorously. I am sure that it could be summarized in a much shorter way. Here is a summary:
The virtual K-1s are a way to keep a running total of the deferred losses as well as get income from those partnerships. On your eventual last sale of EPD, you get to deduct those deferred losses. The virtual K-1s are not needed once they have served the purpose.
part 1. Did you sell? If not, you don't need sales figures for even EPD.
If you bought and sold in the same year, there is no good reason to not just use the revised numbers. One word of (what I think is) wisdom: the EPD basis is the absolute value of the box L "Withdrawals & Distributions" box of the final EPD K-1.
Suggest you go to search and type in "K-1 item 13". You will be led to a discussion thread started 4/4/11 addressing your questions, items #13 and #20. My take from the discussion was that because T5 (Employer's W-2 wages) was zero, I did not have to bother entering any item 13 info (although if you own other MLP's where this entry is not zero, the discussion indicates that even for EPD you may then need to somehow enter item 13 info). Concerning item #20, turbotax does guide you to entry of 20A and 20V. The discussion concerning item #20 suggested it applied to nontaxable accounts (eg an IRÅ) and it seemed from what I could tell that there was no need to enter the X3 and various Y values for taxable accounts (which is where my EPD holdings are). Hope this helps.