This CraftTweaker script allows you to use Pam's HarvestCraft Seeds, Saplings, and Foods (219 in total) in Mekanism's biofuel process (placing them in the crusher).
Currently only non-processed foods are supported. It didn't seem right putting a "Deluxe Cheeseburger" in a crusher to get Biofuel. The item with the highest biofuel output through this addon is a Bamboo Shoot, outputting 5 biofuel.