[Jim Sims]

"I've been researching kits for running veg and also hydrogen. I am certainly interested in alternatives now since we're getting it stuck to us. China will pay for our goods including our diesel, much more than we are apparently willing to.
I would love to burn veg oil from some greasy mex restaurant. My exhaust would smell like a chimmy chonga."

I suspect this "home brew" diesel will soon become illegal due to failure to pay fuel road taxes (there's a reason there's dye in tractor fuel) and the process produces caustic waste effluent that has to be dealt with. Plus diesel and petroleum derived fertilizers were used to grow the feed to raise the cows, chickens, or oil crops that are the source of this waste oil and fat so I suspect in the end one the net gain for the system is pretty small. Further if the rendering industry's raw material gets diverted to vehicle fuels on a large scale this will further drive up the cost of food.

Good luck with the hydrogen; most current supplies are made from natural gas and then shipped and stored at significant cost.