Biodiesel has a relatively high pour point, so in extreme cold weather it will need to be heated some or it will gel.
Live in Lotusland like I do, never gets cold enough .
I think it also depends on the original feedstock going into the transesterification. Cooking oil has long chain molecules but some of the plant oils are shorter. But then making it from plant oils is a bit pointless.
Tropical Forest Felled for Biofuels, Ecologists Say
SPAIN: April 19, 2007
MADRID - Tropical rain forest is being cut down and burned to make way for soy and palm plantations destined to provide plant-based diesel for Europe's fuel tanks, environmentalists said on Wednesday.
They cited cases of deforestation in Brazil, Indonesia and Malaysia to make way for energy crops, and urged governments there to act.
"In Brazil...one of the most affected areas is the state of Mato Grosso, where vast areas have disappeared to make room for soy crops destined for export," Ecologists in Action said in a report distributed at a summit on biofuels in Madrid..... "Biofuels made from unsustainably sourced palm oil are not green," Michelle Desilets, director of the UK-based Borneo Orangutan Survival Foundation told the conference.
"Clearing forests for production of palm oil often involves burning," she said.
Carbon dioxide emissions from forest fires in Indonesia could easily outweigh the emissions European drivers would produce by using fossil fuels instead of biofuel in the first place, she added..........