[radioman]

I still want to get a diesel and make biodiesel from the leftovers of the local fish fry place

Yeah, diesel fuel sure is easier to make than alcohol if you have a source of cheap vegetable oil. You can simply filter and preheat the fryer oil if you don't want to use the lye treatment process.
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[antiRepublicrat]

You can simply filter and preheat the fryer oil if you don't want to use the lye treatment process.

For that you need to modify the engine. Plus you don't get all that glycerine leftover. That plus a little more lye and some more pure fat can put you in the melt-and-pour soap business.

Or you can just break out the old chemistry set and start blowing stuff up. :)