Hi there, sorry I didn't see your post until now. I did a mission to Duna and did all the math (like how was outlined in the wiki) and I happened to take a lot of pictures. You can see that album here: http://imgur.com/a/HEuGd
As you can see, in the transfer from Kerbin to Duna, virtually no supplies or fertilizer was used as when I made it to the two highest warp speeds, supplies were no longer used which caused no fertilizer to be used either. If you have any further question, please let me know.