The butane, propane, methane, 'natural gas like' gasses
are not in the diesel fuel coming off the processor, so your question is moot.
"Give me your tires, your plastic,
Your 20 ton masses yearning to be cracked,
The wretched refuse of your 7-Eleven stores.
Send these, the oxygenless, trashcan-tost to me,
I lift my secret catalyst beside the P2O feedbin door!"