How about sugar cane + centrifuge + cell = Ethanol Cells (better than biofuel) [C2H5OH]
Sugarcane is largely used in brazil to produce ethanol.
I'm just curious, why do you want to have more cells that produce EU, are those methane and hydrogens not enough? and maybe 1 Ethanol Cell + 1 Oil Cells-> 2 Biofuel Cells ?
EDITED: hmm, 1 Et-OH + 3 Fuel -> 4 BioEtFuel (has the same total energy production with Fuel) is probably more appropriate but then...