ok, did a little research...
in 1935, Henry Ford was putting approximately 1 bushel of soy in each vehicle.
The 1935 production year totaled 820,253 automobiles.
The 1935 Soy bean crop yielded almost 16 bushels per acre.
Doing the math, 820,253/15.6 = 52,581 Acres of Soy to produce his automobiles.