There's something wrong in the eu requirement for methane.. you need 128000 to make 5 methane cells, 93000 to make 4 hydrogen cells, and 1000 to make one carbon cell..
So each methane cell is worth (45000*5 - 128000-93000-1000)/5 = 600 eu.. OMG..
EDIT: I know that 128000 is from approximate of 25000 * 5, but then..
Seems pretty pointless. But you can always centrifuge rubber wood for methane and get 155000 EU with no effort.