1. Wheat a and seeds hadn't worked and all my iron was going into hlsa steel and thus I didn't consider shear'd sources of vegetable matter. The sugar cane I had had had all been converted into sugar to make yeast. So all I had on hand to try were apples, wheat, seeds, and saplings. my derp ultimately.
2. Well, I think a lot of corn, rather than wheat is being used for biodiesel. But in the same way that the minecraft 'chicken' seems to be a hybrid chicken-duck I figure wheat is a standin for many-kinds-of-crop.
3. These comments come from my attempt at doing rotarycraft and nothing else.
4. This was just to clarify why I never returned to the gas engine after my initial experiment. I felt my fuel supplies were difficult to replace and hence I wanted to use them optimally. Optimal use of the fuel means matching the torque to the device I would use it with. Which means Id need to make gearboxes. That I'd have to lubricate. Thus (I felt) I needed to produce lubrication PRIOR to using a gas engine (and wasting my precious fuel reserves). But to produce lubrication without a gasoline engine requires some kind of "free" energy - steam engines or a hydrokinetic wheel. And possession of either steam engines or a hydrokinetic engine, coupled with the cheapness of industrial coils, means that the incentive to use the gasoline engine goes away.
I don't know why other people don't make gasoline engines. But its why I don't use mine: Preparing to use it, made it redundant.