After a little research I come away with a couple of things.

1. A lot of misinformation about fuel is out there.

2
One problem with ethanol is its high miscibility with water, which means that it cannot be efficiently shipped through modern pipelines, like liquid hydrocarbons, over long distances.[80] Mechanics also have seen increased cases of damage to small engines, in particular, the carburetor, attributable to the increased water retention by ethanol in fuel
WiKI

So the question becomes: Is the VX motor more sensitive to this water? It is the only thing that closely answers the question. And what is the definition of a small engine? A lawnmower: a Four cylinder: 6: ?