Optimal plastic is plastic that has high hydrocarbon content and needs little or no pre-processing. CRAYOLA feed stock is just one example of optimal plastic and it is shipped free to JBI.
Gas tanks have significant hydrocarbon content but need pre-processing, meaning cut/shredded.
There is a whole continuum of plastic waste that can now be turned into ultra-low sulphur spec fuels with the addition of HTF permitting.