Biodiesel is ridiculously easy here in the People's Republic of Boulder. We actually have an open to the public gas pump that you can buy biodiesel (blend or pure) from.
Also, the damn hippies here have done the engineering so you can distill your own ethanol.
And yeah, the turbine will run on a lot of different fuels. I theory I think it's slightly more efficient on heavier fuels, due to a larger temperature differential (i.e., it gets a lot hotter and so the upper bound give by the carnot efficiency is raised) but that also leads to your turbine getting burned up earlier. Better to lose a percent or two and run on ethanol.
Really, the whole drivetrain has to be designed together. My favorite flavor of the moment is a planetary IVT
used as a power-split device (like the Prius) to either spin an electrical generator (which could then go to either batteries or motors) or else spin up the flywheel. Though the flywheel can also get energy back through the IVT from the wheels. Or you can hold the flywheel still and let the wheels recharge the batteries. Or dump both the flywheel and the turbine through the generator for quick acceleration.
Pretty good system. Efficient, reasonably simple, flexible. Ben Rosen and crew already built one and it worked great.
But it was 20-odd years ahead of its time, unfortunately.