for use in the production of alcohol for motor fuel, at not less than the fuel conversion price (as defined in
section 4005 of this title) for the commodity involved:
Provided, That, for wheat and feed grains, if the fuel conversion price for the commodity involved is less than the then current release price at which producers may repay producer storage loans on the commodity and redeem the commodity prior to the maturity dates of the loans, as determined under clause (5) of the third sentence of section 1445e(b)