John T wrote:

I think bio-diesel is overblown. The premise of this stuff is to use
recycled cooking oil. Even if every resturaunt in the world recycled
its cooking oil, there simply isn't enough to meet the demand if that
method were to become poplar.

Actually, that's for home brewers. Factory made biodiesel is made from
virgin plant oils, of many kinds. The end goal would not necessarily
be total replacement of diesel fuel, but supplementing the supply of DF
by using B5 (5% biodiesel, 95% petrodiesel) up to B25.

Herb