It is possible. However, animal fat contains more saturated fat than vegetable fat, and is often in solid form. In order to get vegetable oil to work in an internal combustion engine, one needs to filter it in some way, and it needs to flow easily into the pistons. This could be accomplished by heating the animal fat to reduce its viscosity (a fluid’s resistance to flow) while it is being filtered and while it is being used. However, the heating system itself would require extra energy.
Another thing about animal fat is that there is much less of it available to us. If we fed cows corn, we would only get 10% of the energy we would have had if we simply converted the corn into a biofuel. So, it would not be adventageous to us to develop infrastructure to service cars fueled by animal fat.
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