hmmmm....I still like the idea of "renewable" fuel....
... if the cost-per-BTU of Bio-Diesel (not as much heat as petroleum #2--that's why less "oomph" and less mpg so ya gotta BOMB the truck more

) would get more competitive, and if the stuff would burn w/out leaving the crusty-crystals (like on a frypan

) in the combustion area... we could (theoretically)
A: reduce need for A-hab the A-rab's stinkin' oil
B: encourage more farmers to grow "sorry-beans", and reduce the "need" (?) for subsidies
C: encourage even more BOMBing research and products
D: get longer life out of our injection pumps (better lubricity)
and
E: reduce emissions of NOx (burns cooler, so not as much time will be spent at 700+*F)----which might all add up to an improvement of Diesel's image with the vocal, uninformed, "environmentalist wackos", and thereby make Diesels more desirable "across the board" for all classes of vehicle, which would be a "plus"..... 'Oo'
There's not much "downside" unless cold-weather gelling is a more pronounced problem (?)