Dear Pat:
You say that you hitted the end of the rope at 35+km/h (an elastic rope I suppose) and you want to hit it even faster? You dont really want to do that!! Trust me, I ripped out the anchorage point of a series III Landy only at 40 km/h and it went trough my back door (I own a Landy too)...
It seams possible. Brazil (at least) survived the 70's fuel crisis converting a big part of the Brazilian cars to ethanol. True, the ethanol was produced from sugar cane and the process was not cheap. The advantage of the process mentioned here is that alledgely is cheap. I think it is not...
