One of the serious drawbacks to biofuels is their viscosity. BioDiesel as an example will gel at a higher temperature than regular diesel. This makes it's use in colder climates very very limited. The only way to prevent it from gelling (besides heating it) is to "cut" it with regular diesel. In my area most users will have 80-90% diesel with the remainder BioDiesel.
Users of "waste" cooking oil derived BioDiesel have problems with not only gelling but a formation of a hardened like what you will see on a heavily used and seldom cleaned deep fryer. In some areas the "bio" fuels will work, but not in all.
Just my $.02, take it as you will.
Bidh cron duine cho mòr ri beinn mun lèir dha fhèin e. (A man's fault will be as big as a mountain before he sees it.)
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